22000020 has 96 divisors (see below), whose sum is σ = 71904000. Its totient is φ = 5023872.

The previous prime is 22000003. The next prime is 22000021. The reversal of 22000020 is 2000022.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a junction number, because it is equal to n+sod(n) for n = 21999972 and 22000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22000021) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 20046 + ... + 21114.

It is an arithmetic number, because the mean of its divisors is an integer number (749000).

Almost surely, 2^22000020 is an apocalyptic number.

22000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22000020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35952000).

22000020 is an abundant number, since it is smaller than the sum of its proper divisors (49903980).

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

22000020 is a wasteful number, since it uses less digits than its factorization.

22000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102 (or 1086 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 6.

The square root of 22000020 is about 4690.4178918301. The cubic root of 22000020 is about 280.2040179758.

Adding to 22000020 its reverse (2000022), we get a palindrome (24000042).

The spelling of 22000020 in words is "twenty-two million, twenty", and thus it is an aban number and an uban number.