20404021031 has 8 divisors (see below), whose sum is σ = 20983459200. Its totient is φ = 19829352312.

The previous prime is 20404020997. The next prime is 20404021039. The reversal of 20404021031 is 13012040402.

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

It is a cyclic number.

It is not a de Polignac number, because 20404021031 - 2³⁰ = 19330279207 is a prime.

It is a super-2 number, since 2×20404021031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404021039) 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, 1183685 + ... + 1200798.

It is an arithmetic number, because the mean of its divisors is an integer number (2622932400).

Almost surely, 2^20404021031 is an apocalyptic number.

20404021031 is a deficient number, since it is larger than the sum of its proper divisors (579438169).

20404021031 is a wasteful number, since it uses less digits than its factorization.

20404021031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384725.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20404021031 its reverse (13012040402), we get a palindrome (33416061433).

The spelling of 20404021031 in words is "twenty billion, four hundred four million, twenty-one thousand, thirty-one".