23420405 has 8 divisors (see below), whose sum is σ = 28176984. Its totient is φ = 18688000.

The previous prime is 23420387. The next prime is 23420437. The reversal of 23420405 is 50402432.

It can be written as a sum of positive squares in 4 ways, for example, as 8988004 + 14432401 = 2998^2 + 3799^2 .

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

It is not a de Polignac number, because 23420405 - 2¹⁴ = 23404021 is a prime.

It is a Duffinian number.

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, 3836 + ... + 7845.

It is an arithmetic number, because the mean of its divisors is an integer number (3522123).

Almost surely, 2^23420405 is an apocalyptic number.

It is an amenable number.

23420405 is a deficient number, since it is larger than the sum of its proper divisors (4756579).

23420405 is a wasteful number, since it uses less digits than its factorization.

23420405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12087.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 23420405 is about 4839.4632966890. The cubic root of 23420405 is about 286.1089654395.

Adding to 23420405 its reverse (50402432), we get a palindrome (73822837).

The spelling of 23420405 in words is "twenty-three million, four hundred twenty thousand, four hundred five".