20544920 has 64 divisors (see below), whose sum is σ = 51438240. Its totient is φ = 7321600.

The previous prime is 20544899. The next prime is 20544929. The reversal of 20544920 is 2944502.

It is a self number, because there is not a number n which added to its sum of digits gives 20544920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20544929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22880 + ... + 23760.

Almost surely, 2^20544920 is an apocalyptic number.

20544920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20544920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25719120).

20544920 is an abundant number, since it is smaller than the sum of its proper divisors (30893320).

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

20544920 is a wasteful number, since it uses less digits than its factorization.

20544920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956 (or 952 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20544920 is about 4532.6504387610. The cubic root of 20544920 is about 273.8849393464.

The spelling of 20544920 in words is "twenty million, five hundred forty-four thousand, nine hundred twenty".