20451055040 has 84 divisors (see below), whose sum is σ = 52733457144. Its totient is φ = 7551138816.

The previous prime is 20451055019. The next prime is 20451055067. The reversal of 20451055040 is 4055015402.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 135002 + ... + 243161.

Almost surely, 2^20451055040 is an apocalyptic number.

20451055040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20451055040 is an abundant number, since it is smaller than the sum of its proper divisors (32282402104).

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

20451055040 is a wasteful number, since it uses less digits than its factorization.

20451055040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378206 (or 378183 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The spelling of 20451055040 in words is "twenty billion, four hundred fifty-one million, fifty-five thousand, forty".