20791813 has 8 divisors (see below), whose sum is σ = 24268032. Its totient is φ = 17442096.

The previous prime is 20791801. The next prime is 20791819. The reversal of 20791813 is 31819702.

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

It is not a de Polignac number, because 20791813 - 2⁵ = 20791781 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 (20791819) 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, 31270 + ... + 31927.

It is an arithmetic number, because the mean of its divisors is an integer number (3033504).

Almost surely, 2^20791813 is an apocalyptic number.

It is an amenable number.

20791813 is a deficient number, since it is larger than the sum of its proper divisors (3476219).

20791813 is an equidigital number, since it uses as much as digits as its factorization.

20791813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63251.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 20791813 is about 4559.8040528075. The cubic root of 20791813 is about 274.9776863438.

The spelling of 20791813 in words is "twenty million, seven hundred ninety-one thousand, eight hundred thirteen".