20544890 has 16 divisors (see below), whose sum is σ = 38927520. Its totient is φ = 7785360.

The previous prime is 20544889. The next prime is 20544899. The reversal of 20544890 is 9844502.

It is a super-2 number, since 2×20544890² = 844185010224200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20544899) 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, 53876 + ... + 54255.

It is an arithmetic number, because the mean of its divisors is an integer number (2432970).

Almost surely, 2^20544890 is an apocalyptic number.

20544890 is a deficient number, since it is larger than the sum of its proper divisors (18382630).

20544890 is a wasteful number, since it uses less digits than its factorization.

20544890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108157.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20544890 is about 4532.6471294377. The cubic root of 20544890 is about 273.8848060360.

The spelling of 20544890 in words is "twenty million, five hundred forty-four thousand, eight hundred ninety".