20236220 has 24 divisors (see below), whose sum is σ = 42580608. Its totient is φ = 8078400.

The previous prime is 20236199. The next prime is 20236253. The reversal of 20236220 is 2263202.

It is a congruent number.

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, 19310 + ... + 20330.

It is an arithmetic number, because the mean of its divisors is an integer number (1774192).

Almost surely, 2^20236220 is an apocalyptic number.

20236220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20236220 is an abundant number, since it is smaller than the sum of its proper divisors (22344388).

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

20236220 is a wasteful number, since it uses less digits than its factorization.

20236220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021 (or 2019 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20236220 is about 4498.4686283223. The cubic root of 20236220 is about 272.5062479279.

Adding to 20236220 its reverse (2263202), we get a palindrome (22499422).

The spelling of 20236220 in words is "twenty million, two hundred thirty-six thousand, two hundred twenty".