20728782 has 12 divisors (see below), whose sum is σ = 44912400. Its totient is φ = 6909588.

The previous prime is 20728781. The next prime is 20728783. The reversal of 20728782 is 28782702.

It is an interprime number because it is at equal distance from previous prime (20728781) and next prime (20728783).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20728781) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 575782 + ... + 575817.

It is an arithmetic number, because the mean of its divisors is an integer number (3742700).

Almost surely, 2^20728782 is an apocalyptic number.

20728782 is an abundant number, since it is smaller than the sum of its proper divisors (24183618).

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

20728782 is a wasteful number, since it uses less digits than its factorization.

20728782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151607 (or 1151604 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 20728782 is about 4552.8872158225. The cubic root of 20728782 is about 274.6995374015.

The spelling of 20728782 in words is "twenty million, seven hundred twenty-eight thousand, seven hundred eighty-two".