22720020 has 24 divisors (see below), whose sum is σ = 63616224. Its totient is φ = 6058656.

The previous prime is 22720013. The next prime is 22720037. The reversal of 22720020 is 2002722.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 189274 + ... + 189393.

It is an arithmetic number, because the mean of its divisors is an integer number (2650676).

Almost surely, 2^22720020 is an apocalyptic number.

22720020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22720020 is an abundant number, since it is smaller than the sum of its proper divisors (40896204).

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

22720020 is a wasteful number, since it uses less digits than its factorization.

22720020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378679 (or 378677 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 15.

The square root of 22720020 is about 4766.5522130781. The cubic root of 22720020 is about 283.2280331502.

Adding to 22720020 its reverse (2002722), we get a palindrome (24722742).

The spelling of 22720020 in words is "twenty-two million, seven hundred twenty thousand, twenty".