20931133374 has 80 divisors (see below), whose sum is σ = 47940480720. Its totient is φ = 6823751040.

The previous prime is 20931133369. The next prime is 20931133393. The reversal of 20931133374 is 47333113902.

It is a happy number.

20931133374 is a `hidden beast` number, since 2 + 0 + 9 + 311 + 3 + 337 + 4 = 666.

It is a super-2 number, since 2×20931133374² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1762962 + ... + 1774794.

It is an arithmetic number, because the mean of its divisors is an integer number (599256009).

Almost surely, 2^20931133374 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20931133374, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23970240360).

20931133374 is an abundant number, since it is smaller than the sum of its proper divisors (27009347346).

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

20931133374 is a wasteful number, since it uses less digits than its factorization.

20931133374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12087 (or 12078 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 36.

The spelling of 20931133374 in words is "twenty billion, nine hundred thirty-one million, one hundred thirty-three thousand, three hundred seventy-four".