20401145 has 8 divisors (see below), whose sum is σ = 24883080. Its totient is φ = 16053120.

The previous prime is 20401141. The next prime is 20401217. The reversal of 20401145 is 54110402.

It can be written as a sum of positive squares in 4 ways, for example, as 6889 + 20394256 = 83^2 + 4516^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20401145 - 2² = 20401141 is a prime.

It is a super-2 number, since 2×20401145² = 832413434622050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20401141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33140 + ... + 33749.

It is an arithmetic number, because the mean of its divisors is an integer number (3110385).

Almost surely, 2^20401145 is an apocalyptic number.

It is an amenable number.

20401145 is a deficient number, since it is larger than the sum of its proper divisors (4481935).

20401145 is an equidigital number, since it uses as much as digits as its factorization.

20401145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66955.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 20401145 is about 4516.7626681064. The cubic root of 20401145 is about 273.2445535916.

Adding to 20401145 its reverse (54110402), we get a palindrome (74511547).

The spelling of 20401145 in words is "twenty million, four hundred one thousand, one hundred forty-five".