20799390 has 32 divisors (see below), whose sum is σ = 50038560. Its totient is φ = 5533184.

The previous prime is 20799377. The next prime is 20799391. The reversal of 20799390 is 9399702.

It is a super-2 number, since 2×20799390² = 865229248744200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20799391) 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, 23842 + ... + 24698.

It is an arithmetic number, because the mean of its divisors is an integer number (1563705).

Almost surely, 2^20799390 is an apocalyptic number.

20799390 is an abundant number, since it is smaller than the sum of its proper divisors (29239170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20799390 is a wasteful number, since it uses less digits than its factorization.

20799390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1676.

The product of its (nonzero) digits is 30618, while the sum is 39.

The square root of 20799390 is about 4560.6348242323. The cubic root of 20799390 is about 275.0110849526.

The spelling of 20799390 in words is "twenty million, seven hundred ninety-nine thousand, three hundred ninety".