20023554 has 16 divisors (see below), whose sum is σ = 40221792. Its totient is φ = 6645408.

The previous prime is 20023537. The next prime is 20023561. The reversal of 20023554 is 45532002.

It is a self number, because there is not a number n which added to its sum of digits gives 20023554.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5764 + ... + 8559.

It is an arithmetic number, because the mean of its divisors is an integer number (2513862).

Almost surely, 2^20023554 is an apocalyptic number.

20023554 is an abundant number, since it is smaller than the sum of its proper divisors (20198238).

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

20023554 is a wasteful number, since it uses less digits than its factorization.

20023554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14561.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 20023554 is about 4474.7685973690. The cubic root of 20023554 is about 271.5482788429.

Adding to 20023554 its reverse (45532002), we get a palindrome (65555556).

The spelling of 20023554 in words is "twenty million, twenty-three thousand, five hundred fifty-four".