22780820 has 12 divisors (see below), whose sum is σ = 47839764. Its totient is φ = 9112320.

The previous prime is 22780817. The next prime is 22780837. The reversal of 22780820 is 2808722.

It can be written as a sum of positive squares in 2 ways, for example, as 7772944 + 15007876 = 2788^2 + 3874^2 .

It is a congruent number.

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, 569501 + ... + 569540.

It is an arithmetic number, because the mean of its divisors is an integer number (3986647).

Almost surely, 2^22780820 is an apocalyptic number.

22780820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22780820 is an abundant number, since it is smaller than the sum of its proper divisors (25058944).

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

22780820 is a wasteful number, since it uses less digits than its factorization.

22780820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139050 (or 1139048 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 22780820 is about 4772.9257274758. The cubic root of 22780820 is about 283.4804526232.

The spelling of 22780820 in words is "twenty-two million, seven hundred eighty thousand, eight hundred twenty".