20106686402 has 12 divisors (see below), whose sum is σ = 33151107318. Its totient is φ = 9139402800.

The previous prime is 20106686389. The next prime is 20106686441. The reversal of 20106686402 is 20468660102.

It can be written as a sum of positive squares in only one way, i.e., 19889742961 + 216943441 = 141031^2 + 14729^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 41542499 + ... + 41542982.

Almost surely, 2^20106686402 is an apocalyptic number.

20106686402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20106686402 is a deficient number, since it is larger than the sum of its proper divisors (13044420916).

20106686402 is a wasteful number, since it uses less digits than its factorization.

20106686402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83085505 (or 83085494 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The spelling of 20106686402 in words is "twenty billion, one hundred six million, six hundred eighty-six thousand, four hundred two".