20551544 has 32 divisors (see below), whose sum is σ = 42082320. Its totient is φ = 9351936.

The previous prime is 20551523. The next prime is 20551561. The reversal of 20551544 is 44515502.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

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, 6239 + ... + 8945.

Almost surely, 2^20551544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20551544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21041160).

20551544 is an abundant number, since it is smaller than the sum of its proper divisors (21530776).

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

20551544 is a wasteful number, since it uses less digits than its factorization.

20551544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2799 (or 2795 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 20551544 is about 4533.3810781799. The cubic root of 20551544 is about 273.9143710972.

The spelling of 20551544 in words is "twenty million, five hundred fifty-one thousand, five hundred forty-four".