20275664557 has 4 divisors (see below), whose sum is σ = 20286739936. Its totient is φ = 20264589180.

The previous prime is 20275664537. The next prime is 20275664561. The reversal of 20275664557 is 75546657202.

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 20275664557 - 2¹⁹ = 20275140269 is a prime.

It is a super-2 number, since 2×20275664557² (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 20275664557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20275664527) 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, 5534943 + ... + 5538604.

It is an arithmetic number, because the mean of its divisors is an integer number (5071684984).

Almost surely, 2^20275664557 is an apocalyptic number.

It is an amenable number.

20275664557 is a deficient number, since it is larger than the sum of its proper divisors (11075379).

20275664557 is a wasteful number, since it uses less digits than its factorization.

20275664557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11075378.

The product of its (nonzero) digits is 3528000, while the sum is 49.

The spelling of 20275664557 in words is "twenty billion, two hundred seventy-five million, six hundred sixty-four thousand, five hundred fifty-seven".