20706989880 has 64 divisors (see below), whose sum is σ = 62185559040. Its totient is φ = 5516122752.

The previous prime is 20706989873. The next prime is 20706989899. The reversal of 20706989880 is 8898960702.

It is a self number, because there is not a number n which added to its sum of digits gives 20706989880.

It is a congruent number.

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, 26817 + ... + 205263.

It is an arithmetic number, because the mean of its divisors is an integer number (971649360).

Almost surely, 2^20706989880 is an apocalyptic number.

20706989880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20706989880 is an abundant number, since it is smaller than the sum of its proper divisors (41478569160).

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

20706989880 is a wasteful number, since it uses less digits than its factorization.

20706989880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179428 (or 179424 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 57.

The spelling of 20706989880 in words is "twenty billion, seven hundred six million, nine hundred eighty-nine thousand, eight hundred eighty".