20917813622 has 16 divisors (see below), whose sum is σ = 32626873440. Its totient is φ = 10045926912.

The previous prime is 20917813577. The next prime is 20917813667. The reversal of 20917813622 is 22631871902.

It is an interprime number because it is at equal distance from previous prime (20917813577) and next prime (20917813667).

It is a self number, because there is not a number n which added to its sum of digits gives 20917813622.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 923138 + ... + 945525.

It is an arithmetic number, because the mean of its divisors is an integer number (2039179590).

Almost surely, 2^20917813622 is an apocalyptic number.

20917813622 is a deficient number, since it is larger than the sum of its proper divisors (11709059818).

20917813622 is a wasteful number, since it uses less digits than its factorization.

20917813622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868887.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 20917813622 in words is "twenty billion, nine hundred seventeen million, eight hundred thirteen thousand, six hundred twenty-two".