20223690 has 16 divisors (see below), whose sum is σ = 48536928. Its totient is φ = 5392976.

The previous prime is 20223667. The next prime is 20223691. The reversal of 20223690 is 9632202.

It is a super-2 number, since 2×20223690² = 817995274432200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20223690.

It is not an unprimeable number, because it can be changed into a prime (20223691) 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, 337032 + ... + 337091.

It is an arithmetic number, because the mean of its divisors is an integer number (3033558).

Almost surely, 2^20223690 is an apocalyptic number.

20223690 is an abundant number, since it is smaller than the sum of its proper divisors (28313238).

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

20223690 is a wasteful number, since it uses less digits than its factorization.

20223690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674133.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 20223690 is about 4497.0757165073. The cubic root of 20223690 is about 272.4499922262.

Adding to 20223690 its reverse (9632202), we get a palindrome (29855892).

The spelling of 20223690 in words is "twenty million, two hundred twenty-three thousand, six hundred ninety".