20930519 has 4 divisors (see below), whose sum is σ = 22161744. Its totient is φ = 19699296.

The previous prime is 20930513. The next prime is 20930579. The reversal of 20930519 is 91503902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20930519 is a prime.

It is a super-2 number, since 2×20930519² = 876173251218722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20930491 and 20930500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20930513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 615587 + ... + 615620.

It is an arithmetic number, because the mean of its divisors is an integer number (5540436).

Almost surely, 2^20930519 is an apocalyptic number.

20930519 is a deficient number, since it is larger than the sum of its proper divisors (1231225).

20930519 is a wasteful number, since it uses less digits than its factorization.

20930519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231224.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 20930519 is about 4574.9884152859. The cubic root of 20930519 is about 275.5878071413.

The spelling of 20930519 in words is "twenty million, nine hundred thirty thousand, five hundred nineteen".