20767400838 has 64 divisors (see below), whose sum is σ = 48889552320. Its totient is φ = 6511919616.

The previous prime is 20767400837. The next prime is 20767400851. The reversal of 20767400838 is 83800476702.

It is a happy number.

20767400838 is a `hidden beast` number, since 207 + 6 + 7 + 400 + 8 + 38 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20767400793 and 20767400802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20767400831) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2269320 + ... + 2278452.

It is an arithmetic number, because the mean of its divisors is an integer number (763899255).

Almost surely, 2^20767400838 is an apocalyptic number.

20767400838 is an abundant number, since it is smaller than the sum of its proper divisors (28122151482).

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

20767400838 is a wasteful number, since it uses less digits than its factorization.

20767400838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11638 (or 11632 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The spelling of 20767400838 in words is "twenty billion, seven hundred sixty-seven million, four hundred thousand, eight hundred thirty-eight".