20873220 has 24 divisors (see below), whose sum is σ = 58445184. Its totient is φ = 5566176.

The previous prime is 20873207. The next prime is 20873221. The reversal of 20873220 is 2237802.

It is not an unprimeable number, because it can be changed into a prime (20873221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173884 + ... + 174003.

It is an arithmetic number, because the mean of its divisors is an integer number (2435216).

Almost surely, 2^20873220 is an apocalyptic number.

20873220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20873220 is an abundant number, since it is smaller than the sum of its proper divisors (37571964).

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

20873220 is a wasteful number, since it uses less digits than its factorization.

20873220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347899 (or 347897 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 20873220 is about 4568.7219219383. The cubic root of 20873220 is about 275.3360959543.

The spelling of 20873220 in words is "twenty million, eight hundred seventy-three thousand, two hundred twenty".