20929380864 has 320 divisors, whose sum is σ = 65880283392. Its totient is φ = 5780275200.

The previous prime is 20929380851. The next prime is 20929380883. The reversal of 20929380864 is 46808392902.

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, 86843784 + ... + 86844024.

Almost surely, 2^20929380864 is an apocalyptic number.

20929380864 is a gapful number since it is divisible by the number (24) 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 20929380864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32940141696).

20929380864 is an abundant number, since it is smaller than the sum of its proper divisors (44950902528).

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

20929380864 is a wasteful number, since it uses less digits than its factorization.

20929380864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507 (or 491 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 51.

The spelling of 20929380864 in words is "twenty billion, nine hundred twenty-nine million, three hundred eighty thousand, eight hundred sixty-four".