22779820 has 24 divisors (see below), whose sum is σ = 54671904. Its totient is φ = 7810176.

The previous prime is 22779811. The next prime is 22779829. The reversal of 22779820 is 2897722.

It is an interprime number because it is at equal distance from previous prime (22779811) and next prime (22779829).

It is a self number, because there is not a number n which added to its sum of digits gives 22779820.

It is not an unprimeable number, because it can be changed into a prime (22779829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81217 + ... + 81496.

It is an arithmetic number, because the mean of its divisors is an integer number (2277996).

Almost surely, 2^22779820 is an apocalyptic number.

22779820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22779820 is an abundant number, since it is smaller than the sum of its proper divisors (31892084).

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

22779820 is a wasteful number, since it uses less digits than its factorization.

22779820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162729 (or 162727 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 22779820 is about 4772.8209687773. The cubic root of 22779820 is about 283.4763046221.

The spelling of 22779820 in words is "twenty-two million, seven hundred seventy-nine thousand, eight hundred twenty".