23220451 has 4 divisors (see below), whose sum is σ = 24442600. Its totient is φ = 21998304.

The previous prime is 23220437. The next prime is 23220481. The reversal of 23220451 is 15402232.

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

It is a cyclic number.

It is not a de Polignac number, because 23220451 - 2⁹ = 23219939 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1222129 = 23220451 / (2 + 3 + 2 + 2 + 0 + 4 + 5 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23220481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 611046 + ... + 611083.

It is an arithmetic number, because the mean of its divisors is an integer number (6110650).

Almost surely, 2^23220451 is an apocalyptic number.

23220451 is a deficient number, since it is larger than the sum of its proper divisors (1222149).

23220451 is a wasteful number, since it uses less digits than its factorization.

23220451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222148.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 23220451 is about 4818.7603177581. The cubic root of 23220451 is about 285.2924094375.

Adding to 23220451 its reverse (15402232), we get a palindrome (38622683).

The spelling of 23220451 in words is "twenty-three million, two hundred twenty thousand, four hundred fifty-one".