20782870 has 8 divisors (see below), whose sum is σ = 37409184. Its totient is φ = 8313144.

The previous prime is 20782849. The next prime is 20782877. The reversal of 20782870 is 7828702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20782877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1039134 + ... + 1039153.

It is an arithmetic number, because the mean of its divisors is an integer number (4676148).

Almost surely, 2^20782870 is an apocalyptic number.

20782870 is a deficient number, since it is larger than the sum of its proper divisors (16626314).

20782870 is a wasteful number, since it uses less digits than its factorization.

20782870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2078294.

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 20782870 is about 4558.8233130930. The cubic root of 20782870 is about 274.9382561106.

The spelling of 20782870 in words is "twenty million, seven hundred eighty-two thousand, eight hundred seventy".