20493563634 has 24 divisors (see below), whose sum is σ = 44613168912. Its totient is φ = 6798811320.

The previous prime is 20493563593. The next prime is 20493563659. The reversal of 20493563634 is 43636539402.

20493563634 is a `hidden beast` number, since 2 + 0 + 4 + 9 + 3 + 5 + 6 + 3 + 634 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20493563634.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2694144 + ... + 2701739.

It is an arithmetic number, because the mean of its divisors is an integer number (1858882038).

Almost surely, 2^20493563634 is an apocalyptic number.

20493563634 is an abundant number, since it is smaller than the sum of its proper divisors (24119605278).

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

20493563634 is a wasteful number, since it uses less digits than its factorization.

20493563634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5396102 (or 5396099 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 45.

The spelling of 20493563634 in words is "twenty billion, four hundred ninety-three million, five hundred sixty-three thousand, six hundred thirty-four".