20629815844 has 24 divisors (see below), whose sum is σ = 40222159488. Its totient is φ = 9177673440.

The previous prime is 20629815749. The next prime is 20629815851. The reversal of 20629815844 is 44851892602.

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, 4985799 + ... + 4989934.

It is an arithmetic number, because the mean of its divisors is an integer number (1675923312).

Almost surely, 2^20629815844 is an apocalyptic number.

It is an amenable number.

20629815844 is a deficient number, since it is larger than the sum of its proper divisors (19592343644).

20629815844 is a wasteful number, since it uses less digits than its factorization.

20629815844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9975795 (or 9975793 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 49.

The spelling of 20629815844 in words is "twenty billion, six hundred twenty-nine million, eight hundred fifteen thousand, eight hundred forty-four".