20105979796 has 12 divisors (see below), whose sum is σ = 40211959648. Its totient is φ = 8616848472.

The previous prime is 20105979793. The next prime is 20105979809. The reversal of 20105979796 is 69797950102.

20105979796 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20105979793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359035326 + ... + 359035381.

Almost surely, 2^20105979796 is an apocalyptic number.

It is an amenable number.

20105979796 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20105979796 is a wasteful number, since it uses less digits than its factorization.

20105979796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718070718 (or 718070716 counting only the distinct ones).

The product of its (nonzero) digits is 2143260, while the sum is 55.

The spelling of 20105979796 in words is "twenty billion, one hundred five million, nine hundred seventy-nine thousand, seven hundred ninety-six".