22401780 has 24 divisors (see below), whose sum is σ = 62725152. Its totient is φ = 5973792.

The previous prime is 22401773. The next prime is 22401787. The reversal of 22401780 is 8710422.

It is an interprime number because it is at equal distance from previous prime (22401773) and next prime (22401787).

It is a self number, because there is not a number n which added to its sum of digits gives 22401780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22401787) 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, 186622 + ... + 186741.

It is an arithmetic number, because the mean of its divisors is an integer number (2613548).

Almost surely, 2^22401780 is an apocalyptic number.

22401780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22401780 is an abundant number, since it is smaller than the sum of its proper divisors (40323372).

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

22401780 is a wasteful number, since it uses less digits than its factorization.

22401780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373375 (or 373373 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 22401780 is about 4733.0518695658. The cubic root of 22401780 is about 281.8994158656.

The spelling of 22401780 in words is "twenty-two million, four hundred one thousand, seven hundred eighty".