20223642 has 48 divisors (see below), whose sum is σ = 43765920. Its totient is φ = 6227712.

The previous prime is 20223629. The next prime is 20223661. The reversal of 20223642 is 24632202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 185484 + ... + 185592.

It is an arithmetic number, because the mean of its divisors is an integer number (911790).

Almost surely, 2^20223642 is an apocalyptic number.

20223642 is an abundant number, since it is smaller than the sum of its proper divisors (23542278).

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

20223642 is a wasteful number, since it uses less digits than its factorization.

20223642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 20223642 is about 4497.0703797028. The cubic root of 20223642 is about 272.4497766768.

Adding to 20223642 its reverse (24632202), we get a palindrome (44855844).

The spelling of 20223642 in words is "twenty million, two hundred twenty-three thousand, six hundred forty-two".