20906876406 has 32 divisors (see below), whose sum is σ = 45042117120. Its totient is φ = 6431181984.

The previous prime is 20906876399. The next prime is 20906876453. The reversal of 20906876406 is 60467860902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 278755 + ... + 345713.

It is an arithmetic number, because the mean of its divisors is an integer number (1407566160).

Almost surely, 2^20906876406 is an apocalyptic number.

20906876406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20906876406 is an abundant number, since it is smaller than the sum of its proper divisors (24135240714).

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

20906876406 is a wasteful number, since it uses less digits than its factorization.

20906876406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70980.

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 20906876406 in words is "twenty billion, nine hundred six million, eight hundred seventy-six thousand, four hundred six".