20126442672 has 90 divisors (see below), whose sum is σ = 65522204748. Its totient is φ = 5750410176.

The previous prime is 20126442659. The next prime is 20126442691. The reversal of 20126442672 is 27624462102.

20126442672 is a `hidden beast` number, since 2 + 0 + 1 + 2 + 644 + 2 + 6 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1419138 + ... + 1433249.

Almost surely, 2^20126442672 is an apocalyptic number.

It is an amenable number.

20126442672 is an abundant number, since it is smaller than the sum of its proper divisors (45395762076).

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

20126442672 is a wasteful number, since it uses less digits than its factorization.

20126442672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2852415 (or 2852399 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The spelling of 20126442672 in words is "twenty billion, one hundred twenty-six million, four hundred forty-two thousand, six hundred seventy-two".