20901320 has 64 divisors (see below), whose sum is σ = 52142400. Its totient is φ = 7476480.

The previous prime is 20901301. The next prime is 20901329. The reversal of 20901320 is 2310902.

It is not an unprimeable number, because it can be changed into a prime (20901329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29126 + ... + 29834.

It is an arithmetic number, because the mean of its divisors is an integer number (814725).

Almost surely, 2^20901320 is an apocalyptic number.

20901320 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 20901320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26071200).

20901320 is an abundant number, since it is smaller than the sum of its proper divisors (31241080).

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

20901320 is a wasteful number, since it uses less digits than its factorization.

20901320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798 (or 794 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 20901320 is about 4571.7961459365. The cubic root of 20901320 is about 275.4595951079.

The spelling of 20901320 in words is "twenty million, nine hundred one thousand, three hundred twenty".