23390420 has 12 divisors (see below), whose sum is σ = 49119924. Its totient is φ = 9356160.

The previous prime is 23390417. The next prime is 23390429. The reversal of 23390420 is 2409332.

It can be written as a sum of positive squares in 2 ways, for example, as 12645136 + 10745284 = 3556^2 + 3278^2 .

It is a super-2 number, since 2×23390420² = 1094223495552800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23390429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 584741 + ... + 584780.

It is an arithmetic number, because the mean of its divisors is an integer number (4093327).

Almost surely, 2^23390420 is an apocalyptic number.

23390420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23390420 is an abundant number, since it is smaller than the sum of its proper divisors (25729504).

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

23390420 is a wasteful number, since it uses less digits than its factorization.

23390420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169530 (or 1169528 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 23390420 is about 4836.3643369788. The cubic root of 23390420 is about 285.9868121130.

Adding to 23390420 its reverse (2409332), we get a palindrome (25799752).

The spelling of 23390420 in words is "twenty-three million, three hundred ninety thousand, four hundred twenty".