20464244646 has 16 divisors (see below), whose sum is σ = 41011852608. Its totient is φ = 6807521000.

The previous prime is 20464244617. The next prime is 20464244657. The reversal of 20464244646 is 64644246402.

It is a junction number, because it is equal to n+sod(n) for n = 20464244598 and 20464244607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3470280 + ... + 3476171.

It is an arithmetic number, because the mean of its divisors is an integer number (2563240788).

Almost surely, 2^20464244646 is an apocalyptic number.

20464244646 is an abundant number, since it is smaller than the sum of its proper divisors (20547607962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20464244646 is a wasteful number, since it uses less digits than its factorization.

20464244646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6946947.

The product of its (nonzero) digits is 884736, while the sum is 42.

The spelling of 20464244646 in words is "twenty billion, four hundred sixty-four million, two hundred forty-four thousand, six hundred forty-six".