20942280 has 64 divisors (see below), whose sum is σ = 69811200. Its totient is φ = 5584320.

The previous prime is 20942239. The next prime is 20942287. The reversal of 20942280 is 8224902.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20942287) 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, 8616 + ... + 10775.

It is an arithmetic number, because the mean of its divisors is an integer number (1090800).

Almost surely, 2^20942280 is an apocalyptic number.

20942280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20942280 is an abundant number, since it is smaller than the sum of its proper divisors (48868920).

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

20942280 is a wasteful number, since it uses less digits than its factorization.

20942280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19411 (or 19401 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20942280 is about 4576.2735932197. The cubic root of 20942280 is about 275.6394156929.

The spelling of 20942280 in words is "twenty million, nine hundred forty-two thousand, two hundred eighty".