21920374 has 8 divisors (see below), whose sum is σ = 37577808. Its totient is φ = 9394440.

The previous prime is 21920359. The next prime is 21920389. The reversal of 21920374 is 47302912.

It is an interprime number because it is at equal distance from previous prime (21920359) and next prime (21920389).

It is a sphenic number, since it is the product of 3 distinct primes.

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, 782857 + ... + 782884.

It is an arithmetic number, because the mean of its divisors is an integer number (4697226).

Almost surely, 2^21920374 is an apocalyptic number.

21920374 is a deficient number, since it is larger than the sum of its proper divisors (15657434).

21920374 is a wasteful number, since it uses less digits than its factorization.

21920374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565750.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 21920374 is about 4681.9199053380. The cubic root of 21920374 is about 279.8654710888.

The spelling of 21920374 in words is "twenty-one million, nine hundred twenty thousand, three hundred seventy-four".