20496650057 has 8 divisors (see below), whose sum is σ = 22203929160. Its totient is φ = 18919982640.

The previous prime is 20496650047. The next prime is 20496650101. The reversal of 20496650057 is 75005669402.

It can be written as a sum of positive squares in 4 ways, for example, as 7957353616 + 12539296441 = 89204^2 + 111979^2 .

It is not a de Polignac number, because 20496650057 - 2²⁰ = 20495601481 is a prime.

It is a super-2 number, since 2×20496650057² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20496650017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4662494 + ... + 4666887.

It is an arithmetic number, because the mean of its divisors is an integer number (2775491145).

Almost surely, 2^20496650057 is an apocalyptic number.

It is an amenable number.

20496650057 is a deficient number, since it is larger than the sum of its proper divisors (1707279103).

20496650057 is an frugal number, since it uses more digits than its factorization.

20496650057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9329420 (or 9329394 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 20496650057 in words is "twenty billion, four hundred ninety-six million, six hundred fifty thousand, fifty-seven".