20495352644 has 72 divisors (see below), whose sum is σ = 39844838880. Its totient is φ = 9215361792.

The previous prime is 20495352623. The next prime is 20495352701. The reversal of 20495352644 is 44625359402.

It is a junction number, because it is equal to n+sod(n) for n = 20495352595 and 20495352604.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15899552 + ... + 15900840.

It is an arithmetic number, because the mean of its divisors is an integer number (553400540).

Almost surely, 2^20495352644 is an apocalyptic number.

It is an amenable number.

20495352644 is a deficient number, since it is larger than the sum of its proper divisors (19349486236).

20495352644 is a wasteful number, since it uses less digits than its factorization.

20495352644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909 (or 1894 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 20495352644 in words is "twenty billion, four hundred ninety-five million, three hundred fifty-two thousand, six hundred forty-four".