20042220 has 48 divisors (see below), whose sum is σ = 61221888. Its totient is φ = 4858560.

The previous prime is 20042173. The next prime is 20042249. The reversal of 20042220 is 2224002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20042196 and 20042205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14524 + ... + 15843.

It is an arithmetic number, because the mean of its divisors is an integer number (1275456).

Almost surely, 2^20042220 is an apocalyptic number.

20042220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20042220 is an abundant number, since it is smaller than the sum of its proper divisors (41179668).

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

20042220 is a wasteful number, since it uses less digits than its factorization.

20042220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30390 (or 30388 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 20042220 is about 4476.8538059669. The cubic root of 20042220 is about 271.6326319330.

Adding to 20042220 its reverse (2224002), we get a palindrome (22266222).

It can be divided in two parts, 2004 and 2220, that added together give a palindrome (4224).

The spelling of 20042220 in words is "twenty million, forty-two thousand, two hundred twenty".