20389776 has 120 divisors (see below), whose sum is σ = 60891936. Its totient is φ = 5829120.

The previous prime is 20389763. The next prime is 20389801. The reversal of 20389776 is 67798302.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 279276 + ... + 279348.

Almost surely, 2^20389776 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 20389776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30445968).

20389776 is an abundant number, since it is smaller than the sum of its proper divisors (40502160).

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

20389776 is a wasteful number, since it uses less digits than its factorization.

20389776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 20389776 is about 4515.5039585854. The cubic root of 20389776 is about 273.1937869219.

The spelling of 20389776 in words is "twenty million, three hundred eighty-nine thousand, seven hundred seventy-six".