20531140400 has 30 divisors (see below), whose sum is σ = 49326065772. Its totient is φ = 8212456000.

The previous prime is 20531140393. The next prime is 20531140447. The reversal of 20531140400 is 404113502.

It is a super-3 number, since 3×20531140400³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 25663526 + ... + 25664325.

Almost surely, 2^20531140400 is an apocalyptic number.

20531140400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20531140400 is an abundant number, since it is smaller than the sum of its proper divisors (28794925372).

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

20531140400 is a wasteful number, since it uses less digits than its factorization.

20531140400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51327869 (or 51327858 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 20531140400 its reverse (404113502), we get a palindrome (20935253902).

The spelling of 20531140400 in words is "twenty billion, five hundred thirty-one million, one hundred forty thousand, four hundred".