20089764 has 72 divisors (see below), whose sum is σ = 55823040. Its totient is φ = 6063552.

The previous prime is 20089763. The next prime is 20089799. The reversal of 20089764 is 46798002.

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 (20089763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15094 + ... + 16370.

It is an arithmetic number, because the mean of its divisors is an integer number (775320).

Almost surely, 2^20089764 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 20089764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27911520).

20089764 is an abundant number, since it is smaller than the sum of its proper divisors (35733276).

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

20089764 is a wasteful number, since it uses less digits than its factorization.

20089764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329 (or 1324 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20089764 is about 4482.1606396915. The cubic root of 20089764 is about 271.8472505963.

The spelling of 20089764 in words is "twenty million, eighty-nine thousand, seven hundred sixty-four".