20402687876408 has 16 divisors (see below), whose sum is σ = 38255455943880. Its totient is φ = 10201232958048.

The previous prime is 20402687876401. The next prime is 20402687876437. The reversal of 20402687876408 is 80467878620402.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402687876401) 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, 13088591 + ... + 14564222.

Almost surely, 2^{20402687876408} is an apocalyptic number.

It is an amenable number.

20402687876408 is a deficient number, since it is larger than the sum of its proper divisors (17852768067472).

20402687876408 is a wasteful number, since it uses less digits than its factorization.

20402687876408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27745046 (or 27745042 counting only the distinct ones).

The product of its (nonzero) digits is 57802752, while the sum is 62.

The spelling of 20402687876408 in words is "twenty trillion, four hundred two billion, six hundred eighty-seven million, eight hundred seventy-six thousand, four hundred eight".