20303919 has 8 divisors (see below), whose sum is σ = 30079920. Its totient is φ = 13535928.

The previous prime is 20303909. The next prime is 20303923. The reversal of 20303919 is 91930302.

It is not a de Polignac number, because 20303919 - 2⁴ = 20303903 is a prime.

It is a super-2 number, since 2×20303919² = 824498253517122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 751997 = 20303919 / (2 + 0 + 3 + 0 + 3 + 9 + 1 + 9).

It is a junction number, because it is equal to n+sod(n) for n = 20303892 and 20303901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303909) 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 7 ways as a sum of consecutive naturals, for example, 375972 + ... + 376025.

It is an arithmetic number, because the mean of its divisors is an integer number (3759990).

Almost surely, 2^20303919 is an apocalyptic number.

20303919 is a deficient number, since it is larger than the sum of its proper divisors (9776001).

20303919 is an equidigital number, since it uses as much as digits as its factorization.

20303919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752006 (or 752000 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 20303919 is about 4505.9870172916. The cubic root of 20303919 is about 272.8097938466.

The spelling of 20303919 in words is "twenty million, three hundred three thousand, nine hundred nineteen".