20020919 has 4 divisors (see below), whose sum is σ = 20446944. Its totient is φ = 19594896.

The previous prime is 20020901. The next prime is 20020937. The reversal of 20020919 is 91902002.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20020901) and next prime (20020937).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20020919 is a prime.

It is a super-2 number, since 2×20020919² = 801674395209122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20020894 and 20020903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212942 + ... + 213035.

It is an arithmetic number, because the mean of its divisors is an integer number (5111736).

Almost surely, 2^20020919 is an apocalyptic number.

20020919 is a deficient number, since it is larger than the sum of its proper divisors (426025).

20020919 is an equidigital number, since it uses as much as digits as its factorization.

20020919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426024.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 20020919 is about 4474.4741590493. The cubic root of 20020919 is about 271.5363668533.

The spelling of 20020919 in words is "twenty million, twenty thousand, nine hundred nineteen".