20747111644 has 48 divisors (see below), whose sum is σ = 44251280640. Its totient is φ = 8308350720.

The previous prime is 20747111599. The next prime is 20747111663. The reversal of 20747111644 is 44611174702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90622 + ... + 222949.

It is an arithmetic number, because the mean of its divisors is an integer number (921901680).

Almost surely, 2^20747111644 is an apocalyptic number.

It is an amenable number.

20747111644 is an abundant number, since it is smaller than the sum of its proper divisors (23504168996).

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

20747111644 is a wasteful number, since it uses less digits than its factorization.

20747111644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313738 (or 313736 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 37.

The spelling of 20747111644 in words is "twenty billion, seven hundred forty-seven million, one hundred eleven thousand, six hundred forty-four".