20110920 has 64 divisors (see below), whose sum is σ = 62424000. Its totient is φ = 5177088.

The previous prime is 20110879. The next prime is 20110927. The reversal of 20110920 is 2901102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20110920.

It is not an unprimeable number, because it can be changed into a prime (20110927) 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, 591 + ... + 6369.

It is an arithmetic number, because the mean of its divisors is an integer number (975375).

Almost surely, 2^20110920 is an apocalyptic number.

20110920 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 20110920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31212000).

20110920 is an abundant number, since it is smaller than the sum of its proper divisors (42313080).

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

20110920 is a wasteful number, since it uses less digits than its factorization.

20110920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5822 (or 5818 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 20110920 is about 4484.5200412084. The cubic root of 20110920 is about 271.9426421731.

The spelling of 20110920 in words is "twenty million, one hundred ten thousand, nine hundred twenty".