20554400550 has 48 divisors (see below), whose sum is σ = 51426061200. Its totient is φ = 5432663040.

The previous prime is 20554400539. The next prime is 20554400567. The reversal of 20554400550 is 5500445502.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 589375 + ... + 623274.

It is an arithmetic number, because the mean of its divisors is an integer number (1071376275).

Almost surely, 2^20554400550 is an apocalyptic number.

20554400550 is an abundant number, since it is smaller than the sum of its proper divisors (30871660650).

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

20554400550 is a wasteful number, since it uses less digits than its factorization.

20554400550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212777 (or 1212772 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 30.

The spelling of 20554400550 in words is "twenty billion, five hundred fifty-four million, four hundred thousand, five hundred fifty".