20661250188 has 48 divisors (see below), whose sum is σ = 48382208000. Its totient is φ = 6862459968.

The previous prime is 20661250157. The next prime is 20661250193. The reversal of 20661250188 is 88105216602.

It is a super-2 number, since 2×20661250188² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9226773 + ... + 9229011.

Almost surely, 2^20661250188 is an apocalyptic number.

It is an amenable number.

20661250188 is an abundant number, since it is smaller than the sum of its proper divisors (27720957812).

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

20661250188 is a wasteful number, since it uses less digits than its factorization.

20661250188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4654 (or 4652 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The spelling of 20661250188 in words is "twenty billion, six hundred sixty-one million, two hundred fifty thousand, one hundred eighty-eight".