20400104431 has 32 divisors (see below), whose sum is σ = 24842999808. Its totient is φ = 16352824320.

The previous prime is 20400104411. The next prime is 20400104479. The reversal of 20400104431 is 13440100402.

It is not a de Polignac number, because 20400104431 - 2⁷ = 20400104303 is a prime.

It is a super-2 number, since 2×20400104431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20400104399 and 20400104408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400104411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19747891 + ... + 19748923.

It is an arithmetic number, because the mean of its divisors is an integer number (776343744).

Almost surely, 2^20400104431 is an apocalyptic number.

20400104431 is a deficient number, since it is larger than the sum of its proper divisors (4442895377).

20400104431 is a wasteful number, since it uses less digits than its factorization.

20400104431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20400104431 its reverse (13440100402), we get a palindrome (33840204833).

The spelling of 20400104431 in words is "twenty billion, four hundred million, one hundred four thousand, four hundred thirty-one".