20970842605 has 32 divisors (see below), whose sum is σ = 26124444000. Its totient is φ = 16152576000.

The previous prime is 20970842597. The next prime is 20970842611. The reversal of 20970842605 is 50624807902.

It can be written as a sum of positive squares in 16 ways, for example, as 13394358756 + 7576483849 = 115734^2 + 87043^2 .

It is not a de Polignac number, because 20970842605 - 2³ = 20970842597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2737821 + ... + 2745469.

It is an arithmetic number, because the mean of its divisors is an integer number (816388875).

Almost surely, 2^20970842605 is an apocalyptic number.

It is an amenable number.

20970842605 is a deficient number, since it is larger than the sum of its proper divisors (5153601395).

20970842605 is a wasteful number, since it uses less digits than its factorization.

20970842605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7905.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 20970842605 in words is "twenty billion, nine hundred seventy million, eight hundred forty-two thousand, six hundred five".