20552362551 has 40 divisors (see below), whose sum is σ = 37151627040. Its totient is φ = 11053366272.

The previous prime is 20552362499. The next prime is 20552362561. The reversal of 20552362551 is 15526325502.

20552362551 is a `hidden beast` number, since 2 + 0 + 5 + 5 + 23 + 625 + 5 + 1 = 666.

It is not a de Polignac number, because 20552362551 - 2²¹ = 20550265399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20552362561) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1056466 + ... + 1075743.

It is an arithmetic number, because the mean of its divisors is an integer number (928790676).

Almost surely, 2^20552362551 is an apocalyptic number.

20552362551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20552362551 is a deficient number, since it is larger than the sum of its proper divisors (16599264489).

20552362551 is a wasteful number, since it uses less digits than its factorization.

20552362551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132245 (or 2132236 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The spelling of 20552362551 in words is "twenty billion, five hundred fifty-two million, three hundred sixty-two thousand, five hundred fifty-one".