20317611840 has 112 divisors (see below), whose sum is σ = 65325223680. Its totient is φ = 5349427200.

The previous prime is 20317611833. The next prime is 20317611859. The reversal of 20317611840 is 4811671302.

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, 58111 + ... + 209790.

Almost surely, 2^20317611840 is an apocalyptic number.

20317611840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20317611840 is an abundant number, since it is smaller than the sum of its proper divisors (45007611840).

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

20317611840 is a wasteful number, since it uses less digits than its factorization.

20317611840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268000 (or 267990 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The spelling of 20317611840 in words is "twenty billion, three hundred seventeen million, six hundred eleven thousand, eight hundred forty".