20269692557 has 4 divisors (see below), whose sum is σ = 20741080800. Its totient is φ = 19798304316.

The previous prime is 20269692551. The next prime is 20269692571. The reversal of 20269692557 is 75529696202.

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 20269692557 - 2²⁴ = 20252915341 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20269692499 and 20269692508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20269692551) 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, 235694057 + ... + 235694142.

It is an arithmetic number, because the mean of its divisors is an integer number (5185270200).

Almost surely, 2^20269692557 is an apocalyptic number.

It is an amenable number.

20269692557 is a deficient number, since it is larger than the sum of its proper divisors (471388243).

20269692557 is an equidigital number, since it uses as much as digits as its factorization.

20269692557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471388242.

The product of its (nonzero) digits is 4082400, while the sum is 53.

The spelling of 20269692557 in words is "twenty billion, two hundred sixty-nine million, six hundred ninety-two thousand, five hundred fifty-seven".