20782879 has 8 divisors (see below), whose sum is σ = 23153760. Its totient is φ = 18522336.

The previous prime is 20782877. The next prime is 20782919. The reversal of 20782879 is 97828702.

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

It is a cyclic number.

It is not a de Polignac number, because 20782879 - 2¹ = 20782877 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 27187 + ... + 27940.

It is an arithmetic number, because the mean of its divisors is an integer number (2894220).

Almost surely, 2^20782879 is an apocalyptic number.

20782879 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20782879 is a deficient number, since it is larger than the sum of its proper divisors (2370881).

20782879 is a wasteful number, since it uses less digits than its factorization.

20782879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55169.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 20782879 is about 4558.8243001897. The cubic root of 20782879 is about 274.9382957978.

The spelling of 20782879 in words is "twenty million, seven hundred eighty-two thousand, eight hundred seventy-nine".