20907960 has 128 divisors (see below), whose sum is σ = 68454720. Its totient is φ = 5087232.

The previous prime is 20907947. The next prime is 20907979. The reversal of 20907960 is 6970902.

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, 75342 + ... + 75618.

Almost surely, 2^20907960 is an apocalyptic number.

20907960 is a gapful number since it is divisible by the number (20) 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 20907960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34227360).

20907960 is an abundant number, since it is smaller than the sum of its proper divisors (47546760).

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

20907960 is a wasteful number, since it uses less digits than its factorization.

20907960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 20907960 is about 4572.5222798801. The cubic root of 20907960 is about 275.4887616559.

The spelling of 20907960 in words is "twenty million, nine hundred seven thousand, nine hundred sixty".