31420420400 has 30 divisors (see below), whose sum is σ = 75487560972. Its totient is φ = 12568168000.

The previous prime is 31420420337. The next prime is 31420420463. The reversal of 31420420400 is 402402413.

It is an interprime number because it is at equal distance from previous prime (31420420337) and next prime (31420420463).

It is a super-2 number, since 2×31420420400² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39275126 + ... + 39275925.

Almost surely, 2^31420420400 is an apocalyptic number.

It is an amenable number.

31420420400 is an abundant number, since it is smaller than the sum of its proper divisors (44067140572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31420420400 is a wasteful number, since it uses less digits than its factorization.

31420420400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78551069 (or 78551058 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 31420420400 its reverse (402402413), we get a palindrome (31822822813).

The spelling of 31420420400 in words is "thirty-one billion, four hundred twenty million, four hundred twenty thousand, four hundred".