20908120706 has 24 divisors (see below), whose sum is σ = 34491483180. Its totient is φ = 9498452480.

The previous prime is 20908120663. The next prime is 20908120711. The reversal of 20908120706 is 60702180902.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20433273025 + 474847681 = 142945^2 + 21791^2 .

It is a super-2 number, since 2×20908120706² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 434270 + ... + 480006.

Almost surely, 2^20908120706 is an apocalyptic number.

20908120706 is a deficient number, since it is larger than the sum of its proper divisors (13583362474).

20908120706 is a wasteful number, since it uses less digits than its factorization.

20908120706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47650 (or 47639 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The spelling of 20908120706 in words is "twenty billion, nine hundred eight million, one hundred twenty thousand, seven hundred six".