20782746 has 24 divisors (see below), whose sum is σ = 45538740. Its totient is φ = 6849216.

The previous prime is 20782733. The next prime is 20782747. The reversal of 20782746 is 64728702.

It can be written as a sum of positive squares in 2 ways, for example, as 15515721 + 5267025 = 3939^2 + 2295^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20782746.

It is not an unprimeable number, because it can be changed into a prime (20782747) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4885 + ... + 8088.

Almost surely, 2^20782746 is an apocalyptic number.

20782746 is an abundant number, since it is smaller than the sum of its proper divisors (24755994).

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

20782746 is a wasteful number, since it uses less digits than its factorization.

20782746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13070 (or 13067 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 20782746 is about 4558.8097130720. The cubic root of 20782746 is about 274.9377093075.

It can be divided in two parts, 20782 and 746, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 20782746 in words is "twenty million, seven hundred eighty-two thousand, seven hundred forty-six".