20807019 has 12 divisors (see below), whose sum is σ = 31361616. Its totient is φ = 13268112.

The previous prime is 20807011. The next prime is 20807069. The reversal of 20807019 is 91070802.

It is not a de Polignac number, because 20807019 - 2³ = 20807011 is a prime.

It is a super-2 number, since 2×20807019² = 865864079332722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20806983 and 20807001.

It is not an unprimeable number, because it can be changed into a prime (20807011) 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 11 ways as a sum of consecutive naturals, for example, 50052 + ... + 50465.

It is an arithmetic number, because the mean of its divisors is an integer number (2613468).

Almost surely, 2^20807019 is an apocalyptic number.

20807019 is a deficient number, since it is larger than the sum of its proper divisors (10554597).

20807019 is a wasteful number, since it uses less digits than its factorization.

20807019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100546 (or 100543 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 20807019 is about 4561.4711442691. The cubic root of 20807019 is about 275.0447045781.

The spelling of 20807019 in words is "twenty million, eight hundred seven thousand, nineteen".