20749932 has 90 divisors (see below), whose sum is σ = 63148932. Its totient is φ = 5924016.

The previous prime is 20749931. The next prime is 20749961. The reversal of 20749932 is 23994702.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20749931) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 15223 + ... + 16529.

Almost surely, 2^20749932 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 20749932, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31574466).

20749932 is an abundant number, since it is smaller than the sum of its proper divisors (42399000).

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

20749932 is a wasteful number, since it uses less digits than its factorization.

20749932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337 (or 1319 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 20749932 is about 4555.2093255964. The cubic root of 20749932 is about 274.7929328287.

The spelling of 20749932 in words is "twenty million, seven hundred forty-nine thousand, nine hundred thirty-two".