22506920 has 16 divisors (see below), whose sum is σ = 50640660. Its totient is φ = 9002752.

The previous prime is 22506889. The next prime is 22506947. The reversal of 22506920 is 2960522.

It can be written as a sum of positive squares in 2 ways, for example, as 19731364 + 2775556 = 4442^2 + 1666^2 .

It is a super-2 number, since 2×22506920² = 1013122895772800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22506920.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281297 + ... + 281376.

Almost surely, 2^22506920 is an apocalyptic number.

22506920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22506920 is an abundant number, since it is smaller than the sum of its proper divisors (28133740).

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

22506920 is a wasteful number, since it uses less digits than its factorization.

22506920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562684 (or 562680 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 22506920 is about 4744.1458662229. The cubic root of 22506920 is about 282.3397477836.

The spelling of 22506920 in words is "twenty-two million, five hundred six thousand, nine hundred twenty".