20917540182 has 64 divisors (see below), whose sum is σ = 52892725248. Its totient is φ = 5356596000.

The previous prime is 20917540177. The next prime is 20917540183. The reversal of 20917540182 is 28104571902.

It is a self number, because there is not a number n which added to its sum of digits gives 20917540182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20917540183) 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, 286044 + ... + 351647.

It is an arithmetic number, because the mean of its divisors is an integer number (826448832).

Almost surely, 2^20917540182 is an apocalyptic number.

20917540182 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20917540182 is an abundant number, since it is smaller than the sum of its proper divisors (31975185066).

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

20917540182 is a wasteful number, since it uses less digits than its factorization.

20917540182 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637785.

The product of its (nonzero) digits is 40320, while the sum is 39.

The spelling of 20917540182 in words is "twenty billion, nine hundred seventeen million, five hundred forty thousand, one hundred eighty-two".