Search a number
-
+
20478611161 = 41499478321
BaseRepresentation
bin10011000100100111…
…101100111011011001
31221212012010020100001
4103010213230323121
5313420011024121
613224023413001
71323323215501
oct230447547331
957765106301
1020478611161
118759707738
123b762b4161
131c148b13c8
14dc3ab0a01
157eccab991
hex4c49eced9

20478611161 has 4 divisors (see below), whose sum is σ = 20978089524. Its totient is φ = 19979132800.

The previous prime is 20478611159. The next prime is 20478611183. The reversal of 20478611161 is 16111687402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10729023561 + 9749587600 = 103581^2 + 98740^2 .

It is a cyclic number.

It is not a de Polignac number, because 20478611161 - 21 = 20478611159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20478611161.

It is not an unprimeable number, because it can be changed into a prime (20478611561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249739120 + ... + 249739201.

It is an arithmetic number, because the mean of its divisors is an integer number (5244522381).

Almost surely, 220478611161 is an apocalyptic number.

It is an amenable number.

20478611161 is a deficient number, since it is larger than the sum of its proper divisors (499478363).

20478611161 is an equidigital number, since it uses as much as digits as its factorization.

20478611161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499478362.

The product of its (nonzero) digits is 16128, while the sum is 37.

The spelling of 20478611161 in words is "twenty billion, four hundred seventy-eight million, six hundred eleven thousand, one hundred sixty-one".

Divisors: 1 41 499478321 20478611161