20544780 has 24 divisors (see below), whose sum is σ = 57525552. Its totient is φ = 5478592.

The previous prime is 20544779. The next prime is 20544787. The reversal of 20544780 is 8744502.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (20544787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171147 + ... + 171266.

It is an arithmetic number, because the mean of its divisors is an integer number (2396898).

Almost surely, 2^20544780 is an apocalyptic number.

20544780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20544780 is an abundant number, since it is smaller than the sum of its proper divisors (36980772).

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

20544780 is a wasteful number, since it uses less digits than its factorization.

20544780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342425 (or 342423 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 20544780 is about 4532.6349952318. The cubic root of 20544780 is about 273.8843172302.

The spelling of 20544780 in words is "twenty million, five hundred forty-four thousand, seven hundred eighty".