20802116397 has 16 divisors (see below), whose sum is σ = 27785907072. Its totient is φ = 13843227840.

The previous prime is 20802116393. The next prime is 20802116399. The reversal of 20802116397 is 79361120802.

It is not a de Polignac number, because 20802116397 - 2² = 20802116393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20802116393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5655523 + ... + 5659199.

It is an arithmetic number, because the mean of its divisors is an integer number (1736619192).

Almost surely, 2^20802116397 is an apocalyptic number.

It is an amenable number.

20802116397 is a deficient number, since it is larger than the sum of its proper divisors (6983790675).

20802116397 is a wasteful number, since it uses less digits than its factorization.

20802116397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6548.

The product of its (nonzero) digits is 36288, while the sum is 39.

The spelling of 20802116397 in words is "twenty billion, eight hundred two million, one hundred sixteen thousand, three hundred ninety-seven".