20737220 has 24 divisors (see below), whose sum is σ = 49769664. Its totient is φ = 7109856.

The previous prime is 20737217. The next prime is 20737243. The reversal of 20737220 is 2273702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73922 + ... + 74201.

It is an arithmetic number, because the mean of its divisors is an integer number (2073736).

Almost surely, 2^20737220 is an apocalyptic number.

20737220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20737220 is an abundant number, since it is smaller than the sum of its proper divisors (29032444).

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

20737220 is a wasteful number, since it uses less digits than its factorization.

20737220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148139 (or 148137 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 23.

The square root of 20737220 is about 4553.8137862675. The cubic root of 20737220 is about 274.7368060368.

The spelling of 20737220 in words is "twenty million, seven hundred thirty-seven thousand, two hundred twenty".