22433781 has 4 divisors (see below), whose sum is σ = 29911712. Its totient is φ = 14955852.

The previous prime is 22433779. The next prime is 22433819. The reversal of 22433781 is 18733422.

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 not a de Polignac number, because 22433781 - 2¹ = 22433779 is a prime.

It is a super-2 number, since 2×22433781² = 1006549059911922, 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 (22431781) 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, 3738961 + ... + 3738966.

It is an arithmetic number, because the mean of its divisors is an integer number (7477928).

Almost surely, 2^22433781 is an apocalyptic number.

It is an amenable number.

22433781 is a deficient number, since it is larger than the sum of its proper divisors (7477931).

22433781 is an equidigital number, since it uses as much as digits as its factorization.

22433781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7477930.

The product of its digits is 8064, while the sum is 30.

The square root of 22433781 is about 4736.4312514804. The cubic root of 22433781 is about 282.0335833451.

The spelling of 22433781 in words is "twenty-two million, four hundred thirty-three thousand, seven hundred eighty-one".