22074781 has 4 divisors (see below), whose sum is σ = 22588192. Its totient is φ = 21561372.

The previous prime is 22074739. The next prime is 22074839. The reversal of 22074781 is 18747022.

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 a cyclic number.

It is not a de Polignac number, because 22074781 - 2¹¹ = 22072733 is a prime.

It is a super-2 number, since 2×22074781² = 974591912395922, 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 (22071781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256641 + ... + 256726.

It is an arithmetic number, because the mean of its divisors is an integer number (5647048).

Almost surely, 2^22074781 is an apocalyptic number.

It is an amenable number.

22074781 is a deficient number, since it is larger than the sum of its proper divisors (513411).

22074781 is an equidigital number, since it uses as much as digits as its factorization.

22074781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513410.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 22074781 is about 4698.3806784891. The cubic root of 22074781 is about 280.5210578124.

The spelling of 22074781 in words is "twenty-two million, seventy-four thousand, seven hundred eighty-one".