20782975 has 12 divisors (see below), whose sum is σ = 26371576. Its totient is φ = 16238880.

The previous prime is 20782969. The next prime is 20782981. The reversal of 20782975 is 57928702.

It is an interprime number because it is at equal distance from previous prime (20782969) and next prime (20782981).

It is not a de Polignac number, because 20782975 - 2¹³ = 20774783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8592 + ... + 10741.

Almost surely, 2^20782975 is an apocalyptic number.

20782975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20782975 is a deficient number, since it is larger than the sum of its proper divisors (5588601).

20782975 is a wasteful number, since it uses less digits than its factorization.

20782975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19386 (or 19381 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 20782975 is about 4558.8348292080. The cubic root of 20782975 is about 274.9387191276.

The spelling of 20782975 in words is "twenty million, seven hundred eighty-two thousand, nine hundred seventy-five".