20015532 has 48 divisors (see below), whose sum is σ = 52175200. Its totient is φ = 6635520.

The previous prime is 20015521. The next prime is 20015537. The reversal of 20015532 is 23551002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20015537) 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, 25644 + ... + 26412.

Almost surely, 2^20015532 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 20015532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26087600).

20015532 is an abundant number, since it is smaller than the sum of its proper divisors (32159668).

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

20015532 is a wasteful number, since it uses less digits than its factorization.

20015532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023 (or 1015 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 20015532 is about 4473.8721483744. The cubic root of 20015532 is about 271.5120107015.

Adding to 20015532 its reverse (23551002), we get a palindrome (43566534).

The spelling of 20015532 in words is "twenty million, fifteen thousand, five hundred thirty-two".