20223612 has 18 divisors (see below), whose sum is σ = 51120888. Its totient is φ = 6741192.

The previous prime is 20223611. The next prime is 20223617. The reversal of 20223612 is 21632202.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20223611) 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 5 ways as a sum of consecutive naturals, for example, 280848 + ... + 280919.

Almost surely, 2^20223612 is an apocalyptic number.

It is an amenable number.

20223612 is an abundant number, since it is smaller than the sum of its proper divisors (30897276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20223612 is a wasteful number, since it uses less digits than its factorization.

20223612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561777 (or 561772 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20223612 is about 4497.0670441967. The cubic root of 20223612 is about 272.4496419583.

Adding to 20223612 its reverse (21632202), we get a palindrome (41855814).

The spelling of 20223612 in words is "twenty million, two hundred twenty-three thousand, six hundred twelve".