20718990126 has 48 divisors (see below), whose sum is σ = 45955362960. Its totient is φ = 6743842560.

The previous prime is 20718990107. The next prime is 20718990133. The reversal of 20718990126 is 62109981702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 149830 + ... + 252758.

It is an arithmetic number, because the mean of its divisors is an integer number (957403395).

Almost surely, 2^20718990126 is an apocalyptic number.

20718990126 is an abundant number, since it is smaller than the sum of its proper divisors (25236372834).

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

20718990126 is a wasteful number, since it uses less digits than its factorization.

20718990126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103201 (or 103198 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The spelling of 20718990126 in words is "twenty billion, seven hundred eighteen million, nine hundred ninety thousand, one hundred twenty-six".