23220518 has 4 divisors (see below), whose sum is σ = 34830780. Its totient is φ = 11610258.

The previous prime is 23220499. The next prime is 23220529. The reversal of 23220518 is 81502232.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23220493 and 23220502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5805128 + ... + 5805131.

It is an arithmetic number, because the mean of its divisors is an integer number (8707695).

Almost surely, 2^23220518 is an apocalyptic number.

23220518 is a deficient number, since it is larger than the sum of its proper divisors (11610262).

23220518 is a wasteful number, since it uses less digits than its factorization.

23220518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11610261.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 23220518 is about 4818.7672697486. The cubic root of 23220518 is about 285.2926838303.

The spelling of 23220518 in words is "twenty-three million, two hundred twenty thousand, five hundred eighteen".