20646254543636 has 48 divisors (see below), whose sum is σ = 36696099783168. Its totient is φ = 10162113343200.

The previous prime is 20646254543633. The next prime is 20646254543671. The reversal of 20646254543636 is 63634545264602.

It is a super-2 number, since 2×20646254543636² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20646254543633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 506474591 + ... + 506515353.

It is an arithmetic number, because the mean of its divisors is an integer number (764502078816).

Almost surely, 2^{20646254543636} is an apocalyptic number.

It is an amenable number.

20646254543636 is a deficient number, since it is larger than the sum of its proper divisors (16049845239532).

20646254543636 is a wasteful number, since it uses less digits than its factorization.

20646254543636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43532 (or 43530 counting only the distinct ones).

The product of its (nonzero) digits is 74649600, while the sum is 56.

The spelling of 20646254543636 in words is "twenty trillion, six hundred forty-six billion, two hundred fifty-four million, five hundred forty-three thousand, six hundred thirty-six".