20708139924 has 36 divisors (see below), whose sum is σ = 52745172480. Its totient is φ = 6850019280.

The previous prime is 20708139917. The next prime is 20708139929. The reversal of 20708139924 is 42993180702.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×20708139924² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20708139924.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20708139929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2190804 + ... + 2200235.

It is an arithmetic number, because the mean of its divisors is an integer number (1465143680).

Almost surely, 2^20708139924 is an apocalyptic number.

It is an amenable number.

20708139924 is an abundant number, since it is smaller than the sum of its proper divisors (32037032556).

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

20708139924 is a wasteful number, since it uses less digits than its factorization.

20708139924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4391180 (or 4391175 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 20708139924 in words is "twenty billion, seven hundred eight million, one hundred thirty-nine thousand, nine hundred twenty-four".