23781420 has 72 divisors (see below), whose sum is σ = 77693616. Its totient is φ = 5853312.

The previous prime is 23781413. The next prime is 23781437. The reversal of 23781420 is 2418732.

23781420 is a `hidden beast` number, since 237 + 8 + 1 + 420 = 666.

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 23 ways as a sum of consecutive naturals, for example, 2742 + ... + 7421.

It is an arithmetic number, because the mean of its divisors is an integer number (1079078).

Almost surely, 2^23781420 is an apocalyptic number.

23781420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23781420 is an abundant number, since it is smaller than the sum of its proper divisors (53912196).

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

23781420 is a wasteful number, since it uses less digits than its factorization.

23781420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10191 (or 10186 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 23781420 is about 4876.6197309202. The cubic root of 23781420 is about 287.5715562279.

The spelling of 23781420 in words is "twenty-three million, seven hundred eighty-one thousand, four hundred twenty".