20022220 has 24 divisors (see below), whose sum is σ = 42286608. Its totient is φ = 7963200.

The previous prime is 20022203. The next prime is 20022229. The reversal of 20022220 is 2222002.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20022197 and 20022206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 855 + ... + 6385.

It is an arithmetic number, because the mean of its divisors is an integer number (1761942).

Almost surely, 2^20022220 is an apocalyptic number.

20022220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20022220 is an abundant number, since it is smaller than the sum of its proper divisors (22264388).

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

20022220 is a wasteful number, since it uses less digits than its factorization.

20022220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5721 (or 5719 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 20022220 is about 4474.6195368992. The cubic root of 20022220 is about 271.5422483875.

Adding to 20022220 its reverse (2222002), we get a palindrome (22244222).

The spelling of 20022220 in words is "twenty million, twenty-two thousand, two hundred twenty".