23778820 has 24 divisors (see below), whose sum is σ = 53777304. Its totient is φ = 8779776.

The previous prime is 23778809. The next prime is 23778857. The reversal of 23778820 is 2887732.

It can be written as a sum of positive squares in 4 ways, for example, as 42436 + 23736384 = 206^2 + 4872^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 23778820.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45469 + ... + 45988.

It is an arithmetic number, because the mean of its divisors is an integer number (2240721).

Almost surely, 2^23778820 is an apocalyptic number.

23778820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23778820 is an abundant number, since it is smaller than the sum of its proper divisors (29998484).

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

23778820 is a wasteful number, since it uses less digits than its factorization.

23778820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91479 (or 91477 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 23778820 is about 4876.3531455382. The cubic root of 23778820 is about 287.5610758711.

The spelling of 23778820 in words is "twenty-three million, seven hundred seventy-eight thousand, eight hundred twenty".