20799819 has 12 divisors (see below), whose sum is σ = 30133896. Its totient is φ = 13825152.

The previous prime is 20799811. The next prime is 20799829. The reversal of 20799819 is 91899702.

It is not a de Polignac number, because 20799819 - 2³ = 20799811 is a prime.

It is a super-2 number, since 2×20799819² = 865264940865522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20799811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97 + ... + 6450.

It is an arithmetic number, because the mean of its divisors is an integer number (2511158).

Almost surely, 2^20799819 is an apocalyptic number.

20799819 is a deficient number, since it is larger than the sum of its proper divisors (9334077).

20799819 is a wasteful number, since it uses less digits than its factorization.

20799819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6906 (or 6903 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 20799819 is about 4560.6818569157. The cubic root of 20799819 is about 275.0129756963.

The spelling of 20799819 in words is "twenty million, seven hundred ninety-nine thousand, eight hundred nineteen".