20437906128 has 20 divisors (see below), whose sum is σ = 52797924288. Its totient is φ = 6812635360.

The previous prime is 20437906121. The next prime is 20437906211. The reversal of 20437906128 is 82160973402.

It is a self number, because there is not a number n which added to its sum of digits gives 20437906128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20437906121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212894808 + ... + 212894903.

Almost surely, 2^20437906128 is an apocalyptic number.

It is an amenable number.

20437906128 is an abundant number, since it is smaller than the sum of its proper divisors (32360018160).

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

20437906128 is a wasteful number, since it uses less digits than its factorization.

20437906128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425789722 (or 425789716 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 20437906128 in words is "twenty billion, four hundred thirty-seven million, nine hundred six thousand, one hundred twenty-eight".