20642524157 has 4 divisors (see below), whose sum is σ = 20676986400. Its totient is φ = 20608061916.

The previous prime is 20642524117. The next prime is 20642524171. The reversal of 20642524157 is 75142524602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20642524157 - 2²⁴ = 20625746941 is a prime.

It is a super-2 number, since 2×20642524157² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20642524157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20642524117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17230223 + ... + 17231420.

It is an arithmetic number, because the mean of its divisors is an integer number (5169246600).

Almost surely, 2^20642524157 is an apocalyptic number.

It is an amenable number.

20642524157 is a deficient number, since it is larger than the sum of its proper divisors (34462243).

20642524157 is an equidigital number, since it uses as much as digits as its factorization.

20642524157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34462242.

The product of its (nonzero) digits is 134400, while the sum is 38.

The spelling of 20642524157 in words is "twenty billion, six hundred forty-two million, five hundred twenty-four thousand, one hundred fifty-seven".