22779420 has 96 divisors (see below), whose sum is σ = 67823616. Its totient is φ = 5702400.

The previous prime is 22779403. The next prime is 22779437. The reversal of 22779420 is 2497722.

It is an interprime number because it is at equal distance from previous prime (22779403) and next prime (22779437).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

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, 68655 + ... + 68985.

It is an arithmetic number, because the mean of its divisors is an integer number (706496).

Almost surely, 2^22779420 is an apocalyptic number.

22779420 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 22779420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33911808).

22779420 is an abundant number, since it is smaller than the sum of its proper divisors (45044196).

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

22779420 is a wasteful number, since it uses less digits than its factorization.

22779420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 22779420 is about 4772.7790646541. The cubic root of 22779420 is about 283.4746453876.

The spelling of 22779420 in words is "twenty-two million, seven hundred seventy-nine thousand, four hundred twenty".