20550531400 has 72 divisors (see below), whose sum is σ = 55580825970. Its totient is φ = 7045893120.

The previous prime is 20550531389. The next prime is 20550531401. The reversal of 20550531400 is 413505502.

It can be written as a sum of positive squares in 3 ways, for example, as 20069255556 + 481275844 = 141666^2 + 21938^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (20550531401) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1038697 + ... + 1058296.

Almost surely, 2^20550531400 is an apocalyptic number.

20550531400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20550531400 is an abundant number, since it is smaller than the sum of its proper divisors (35030294570).

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

20550531400 is a wasteful number, since it uses less digits than its factorization.

20550531400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097023 (or 2097007 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The spelling of 20550531400 in words is "twenty billion, five hundred fifty million, five hundred thirty-one thousand, four hundred".