20472752551 has 4 divisors (see below), whose sum is σ = 20473052752. Its totient is φ = 20472452352.

The previous prime is 20472752549. The next prime is 20472752581. The reversal of 20472752551 is 15525727402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 15525727402 = 2 ⋅7762863701.

It is a cyclic number.

It is not a de Polignac number, because 20472752551 - 2¹ = 20472752549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20472752581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7015 + ... + 202471.

It is an arithmetic number, because the mean of its divisors is an integer number (5118263188).

Almost surely, 2^20472752551 is an apocalyptic number.

20472752551 is a deficient number, since it is larger than the sum of its proper divisors (300201).

20472752551 is a wasteful number, since it uses less digits than its factorization.

20472752551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300200.

The product of its (nonzero) digits is 196000, while the sum is 40.

The spelling of 20472752551 in words is "twenty billion, four hundred seventy-two million, seven hundred fifty-two thousand, five hundred fifty-one".