20108220 has 48 divisors (see below), whose sum is σ = 61423488. Its totient is φ = 4874560.

The previous prime is 20108201. The next prime is 20108227. The reversal of 20108220 is 2280102.

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 20108220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20108227) 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, 14574 + ... + 15893.

It is an arithmetic number, because the mean of its divisors is an integer number (1279656).

Almost surely, 2^20108220 is an apocalyptic number.

20108220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20108220 is an abundant number, since it is smaller than the sum of its proper divisors (41315268).

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

20108220 is a wasteful number, since it uses less digits than its factorization.

20108220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30490 (or 30488 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 20108220 is about 4484.2189955443. The cubic root of 20108220 is about 271.9304717040.

Adding to 20108220 its reverse (2280102), we get a palindrome (22388322).

It can be divided in two parts, 201082 and 20, that added together give a palindrome (201102).

The spelling of 20108220 in words is "twenty million, one hundred eight thousand, two hundred twenty".