22780720 has 20 divisors (see below), whose sum is σ = 52965360. Its totient is φ = 9112256.

The previous prime is 22780699. The next prime is 22780721. The reversal of 22780720 is 2708722.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×22780720² = 1037922407436800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22780721) 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 3 ways as a sum of consecutive naturals, for example, 142300 + ... + 142459.

It is an arithmetic number, because the mean of its divisors is an integer number (2648268).

Almost surely, 2^22780720 is an apocalyptic number.

22780720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22780720 is an abundant number, since it is smaller than the sum of its proper divisors (30184640).

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

22780720 is a wasteful number, since it uses less digits than its factorization.

22780720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284772 (or 284766 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 22780720 is about 4772.9152517094. The cubic root of 22780720 is about 283.4800378285.

The spelling of 22780720 in words is "twenty-two million, seven hundred eighty thousand, seven hundred twenty".