22723581 has 8 divisors (see below), whose sum is σ = 30516640. Its totient is φ = 15039792.

The previous prime is 22723579. The next prime is 22723583. The reversal of 22723581 is 18532722.

It is an interprime number because it is at equal distance from previous prime (22723579) and next prime (22723583).

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

It is not a de Polignac number, because 22723581 - 2¹ = 22723579 is a prime.

It is a super-2 number, since 2×22723581² = 1032722266927122, 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 (22723583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26830 + ... + 27663.

It is an arithmetic number, because the mean of its divisors is an integer number (3814580).

Almost surely, 2^22723581 is an apocalyptic number.

It is an amenable number.

22723581 is a deficient number, since it is larger than the sum of its proper divisors (7793059).

22723581 is a wasteful number, since it uses less digits than its factorization.

22723581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54635.

The product of its digits is 6720, while the sum is 30.

The square root of 22723581 is about 4766.9257388804. The cubic root of 22723581 is about 283.2428295329.

The spelling of 22723581 in words is "twenty-two million, seven hundred twenty-three thousand, five hundred eighty-one".