20708239680 has 140 divisors (see below), whose sum is σ = 73662943860. Its totient is φ = 5522190336.

The previous prime is 20708239663. The next prime is 20708239687. The reversal of 20708239680 is 8693280702.

It can be written as a sum of positive squares in 2 ways, for example, as 4522293504 + 16185946176 = 67248^2 + 127224^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20708239687) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 373545 + ... + 425384.

Almost surely, 2^20708239680 is an apocalyptic number.

20708239680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20708239680 is an abundant number, since it is smaller than the sum of its proper divisors (52954704180).

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

20708239680 is an equidigital number, since it uses as much as digits as its factorization.

20708239680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798958 (or 798939 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 20708239680 in words is "twenty billion, seven hundred eight million, two hundred thirty-nine thousand, six hundred eighty".