20929311292912 has 80 divisors (see below), whose sum is σ = 45165717780480. Its totient is φ = 9314338592000.

The previous prime is 20929311292889. The next prime is 20929311292931. The reversal of 20929311292912 is 21929211392902.

It is a happy number.

It is a super-2 number, since 2×20929311292912² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20929311292912.

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, 2126037 + ... + 6810187.

It is an arithmetic number, because the mean of its divisors is an integer number (564571472256).

Almost surely, 2^{20929311292912} is an apocalyptic number.

20929311292912 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20929311292912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22582858890240).

20929311292912 is an abundant number, since it is smaller than the sum of its proper divisors (24236406487568).

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

20929311292912 is a wasteful number, since it uses less digits than its factorization.

20929311292912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4684702 (or 4684696 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 52.

The spelling of 20929311292912 in words is "twenty trillion, nine hundred twenty-nine billion, three hundred eleven million, two hundred ninety-two thousand, nine hundred twelve".