20908860 has 48 divisors (see below), whose sum is σ = 66909696. Its totient is φ = 4779072.

The previous prime is 20908837. The next prime is 20908883. The reversal of 20908860 is 6880902.

It is an interprime number because it is at equal distance from previous prime (20908837) and next prime (20908883).

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, 24472 + ... + 25311.

It is an arithmetic number, because the mean of its divisors is an integer number (1393952).

Almost surely, 2^20908860 is an apocalyptic number.

20908860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20908860 is an abundant number, since it is smaller than the sum of its proper divisors (46000836).

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

20908860 is a wasteful number, since it uses less digits than its factorization.

20908860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49802 (or 49800 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 20908860 is about 4572.6206927756. The cubic root of 20908860 is about 275.4927144778.

The spelling of 20908860 in words is "twenty million, nine hundred eight thousand, eight hundred sixty".