20005554400 has 72 divisors (see below), whose sum is σ = 52595399304. Its totient is φ = 7386662400.

The previous prime is 20005554397. The next prime is 20005554407. The reversal of 20005554400 is 445550002.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005554407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 951406 + ... + 972205.

It is an arithmetic number, because the mean of its divisors is an integer number (730491657).

Almost surely, 2^20005554400 is an apocalyptic number.

20005554400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20005554400 is an abundant number, since it is smaller than the sum of its proper divisors (32589844904).

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

20005554400 is a wasteful number, since it uses less digits than its factorization.

20005554400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923644 (or 1923631 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 25.

The spelling of 20005554400 in words is "twenty billion, five million, five hundred fifty-four thousand, four hundred".