20958809600 has 60 divisors (see below), whose sum is σ = 51927119904. Its totient is φ = 8383518720.

The previous prime is 20958809587. The next prime is 20958809621. The reversal of 20958809600 is 690885902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 805904 + ... + 831503.

Almost surely, 2^20958809600 is an apocalyptic number.

20958809600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20958809600 is an abundant number, since it is smaller than the sum of its proper divisors (30968310304).

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

20958809600 is an equidigital number, since it uses as much as digits as its factorization.

20958809600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637435 (or 1637414 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 47.

The spelling of 20958809600 in words is "twenty billion, nine hundred fifty-eight million, eight hundred nine thousand, six hundred".