23203981 has 4 divisors (see below), whose sum is σ = 23279872. Its totient is φ = 23128092.

The previous prime is 23203969. The next prime is 23203993. The reversal of 23203981 is 18930232.

23203981 is nontrivially palindromic in base 2.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (23203969) and next prime (23203993).

It is a cyclic number.

It is not a de Polignac number, because 23203981 - 2¹¹ = 23201933 is a prime.

It is a super-2 number, since 2×23203981² = 1076849468496722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23203931) 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, 37485 + ... + 38098.

It is an arithmetic number, because the mean of its divisors is an integer number (5819968).

Almost surely, 2^23203981 is an apocalyptic number.

It is an amenable number.

23203981 is a deficient number, since it is larger than the sum of its proper divisors (75891).

23203981 is an equidigital number, since it uses as much as digits as its factorization.

23203981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75890.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 23203981 is about 4817.0510688595. The cubic root of 23203981 is about 285.2249419373.

The spelling of 23203981 in words is "twenty-three million, two hundred three thousand, nine hundred eighty-one".