23920405 has 8 divisors (see below), whose sum is σ = 28959192. Its totient is φ = 18966528.

The previous prime is 23920387. The next prime is 23920423. The reversal of 23920405 is 50402932.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (23920387) and next prime (23920423).

It can be written as a sum of positive squares in 4 ways, for example, as 707281 + 23213124 = 841^2 + 4818^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 23920405 - 2⁷ = 23920277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23920405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20604 + ... + 21733.

It is an arithmetic number, because the mean of its divisors is an integer number (3619899).

Almost surely, 2^23920405 is an apocalyptic number.

It is an amenable number.

23920405 is a deficient number, since it is larger than the sum of its proper divisors (5038787).

23920405 is a wasteful number, since it uses less digits than its factorization.

23920405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42455.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 23920405 is about 4890.8491082838. The cubic root of 23920405 is about 288.1306835223.

The spelling of 23920405 in words is "twenty-three million, nine hundred twenty thousand, four hundred five".