20917549426740 has 96 divisors (see below), whose sum is σ = 59811419740800. Its totient is φ = 5460567436800.

The previous prime is 20917549426727. The next prime is 20917549426811. The reversal of 20917549426740 is 4762494571902.

It is a super-2 number, since 2×20917549426740² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12770815 + ... + 14315334.

It is an arithmetic number, because the mean of its divisors is an integer number (623035622300).

Almost surely, 2^{20917549426740} is an apocalyptic number.

20917549426740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20917549426740 is an abundant number, since it is smaller than the sum of its proper divisors (38893870314060).

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

20917549426740 is a wasteful number, since it uses less digits than its factorization.

20917549426740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27086433 (or 27086431 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 60.

The spelling of 20917549426740 in words is "twenty trillion, nine hundred seventeen billion, five hundred forty-nine million, four hundred twenty-six thousand, seven hundred forty".