20041400561 has 24 divisors (see below), whose sum is σ = 24813921600. Its totient is φ = 15849228096.

The previous prime is 20041400399. The next prime is 20041400567. The reversal of 20041400561 is 16500414002.

It is not a de Polignac number, because 20041400561 - 2³⁰ = 18967658737 is a prime.

It is a super-2 number, since 2×20041400561² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20041400567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4847051 + ... + 4851183.

It is an arithmetic number, because the mean of its divisors is an integer number (1033913400).

Almost surely, 2^20041400561 is an apocalyptic number.

It is an amenable number.

20041400561 is a deficient number, since it is larger than the sum of its proper divisors (4772521039).

20041400561 is a wasteful number, since it uses less digits than its factorization.

20041400561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8265 (or 8252 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 20041400561 its reverse (16500414002), we get a palindrome (36541814563).

The spelling of 20041400561 in words is "twenty billion, forty-one million, four hundred thousand, five hundred sixty-one".