20117853690 has 32 divisors (see below), whose sum is σ = 52672199616. Its totient is φ = 4877055360.

The previous prime is 20117853677. The next prime is 20117853731. The reversal of 20117853690 is 9635871102.

It is a super-2 number, since 2×20117853690² (a number of 21 digits) contains 22 as substring.

It is a Curzon 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, 30481267 + ... + 30481926.

It is an arithmetic number, because the mean of its divisors is an integer number (1646006238).

Almost surely, 2^20117853690 is an apocalyptic number.

20117853690 is an abundant number, since it is smaller than the sum of its proper divisors (32554345926).

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

20117853690 is a wasteful number, since it uses less digits than its factorization.

20117853690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60963214.

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 20117853690 in words is "twenty billion, one hundred seventeen million, eight hundred fifty-three thousand, six hundred ninety".