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20464160809 = 1430532
BaseRepresentation
bin10011000011110000…
…100101000000101001
31221211011221002011211
4103003300211000221
5313402311121214
613222345553121
71323056332261
oct230360450051
957734832154
1020464160809
1187515379a4
123b714a57a1
131c118c1cc1
14dc1bcc7a1
157eb8a50c4
hex4c3c25029

20464160809 has 3 divisors (see below), whose sum is σ = 20464303863. Its totient is φ = 20464017756.

The previous prime is 20464160803. The next prime is 20464160861. The reversal of 20464160809 is 90806146402.

The square root of 20464160809 is 143053.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 20367571225 + 96589584 = 142715^2 + 9828^2 .

It is not a de Polignac number, because 20464160809 - 25 = 20464160777 is a prime.

It is a super-2 number, since 2×204641608092 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20464160803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 71527 + ... + 214579.

It is an arithmetic number, because the mean of its divisors is an integer number (6821434621).

Almost surely, 220464160809 is an apocalyptic number.

20464160809 is the 143053-rd square number.

20464160809 is the 71527-th centered octagonal number.

It is an amenable number.

20464160809 is a deficient number, since it is larger than the sum of its proper divisors (143054).

20464160809 is an frugal number, since it uses more digits than its factorization.

20464160809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286106 (or 143053 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 20464160809 in words is "twenty billion, four hundred sixty-four million, one hundred sixty thousand, eight hundred nine".

Divisors: 1 143053 20464160809