20801913720 has 64 divisors (see below), whose sum is σ = 71320849920. Its totient is φ = 4754722944.

The previous prime is 20801913689. The next prime is 20801913721. The reversal of 20801913720 is 2731910802.

It is a super-2 number, since 2×20801913720² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20801913721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12381252 + ... + 12382931.

It is an arithmetic number, because the mean of its divisors is an integer number (1114388280).

Almost surely, 2^20801913720 is an apocalyptic number.

20801913720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20801913720 is an abundant number, since it is smaller than the sum of its proper divisors (50518936200).

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

20801913720 is a wasteful number, since it uses less digits than its factorization.

20801913720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24764204 (or 24764200 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The spelling of 20801913720 in words is "twenty billion, eight hundred one million, nine hundred thirteen thousand, seven hundred twenty".