20091544 has 32 divisors (see below), whose sum is σ = 41317200. Its totient is φ = 9083520.

The previous prime is 20091541. The next prime is 20091551. The reversal of 20091544 is 44519002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20091541) 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, 19654 + ... + 20650.

Almost surely, 2^20091544 is an apocalyptic number.

It is an amenable number.

20091544 is an abundant number, since it is smaller than the sum of its proper divisors (21225656).

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

20091544 is a wasteful number, since it uses less digits than its factorization.

20091544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243 (or 1239 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20091544 is about 4482.3592002427. The cubic root of 20091544 is about 271.8552791262.

It can be divided in two parts, 2009 and 1544, that added together give a palindrome (3553).

The spelling of 20091544 in words is "twenty million, ninety-one thousand, five hundred forty-four".