20791015 has 16 divisors (see below), whose sum is σ = 28597248. Its totient is φ = 14214816.

The previous prime is 20791007. The next prime is 20791019. The reversal of 20791015 is 51019702.

It is not a de Polignac number, because 20791015 - 2³ = 20791007 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 (20791019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15564 + ... + 16846.

It is an arithmetic number, because the mean of its divisors is an integer number (1787328).

Almost surely, 2^20791015 is an apocalyptic number.

20791015 is a deficient number, since it is larger than the sum of its proper divisors (7806233).

20791015 is a wasteful number, since it uses less digits than its factorization.

20791015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 20791015 is about 4559.7165482078. The cubic root of 20791015 is about 274.9741683725.

The spelling of 20791015 in words is "twenty million, seven hundred ninety-one thousand, fifteen".