20501519 has 2 divisors, whose sum is σ = 20501520. Its totient is φ = 20501518.

The previous prime is 20501501. The next prime is 20501543. The reversal of 20501519 is 91510502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20501519 - 2²⁰ = 19452943 is a prime.

It is a super-2 number, since 2×20501519² = 840624562614722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20501494 and 20501503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20501419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10250759 + 10250760.

It is an arithmetic number, because the mean of its divisors is an integer number (10250760).

Almost surely, 2^20501519 is an apocalyptic number.

20501519 is a deficient number, since it is larger than the sum of its proper divisors (1).

20501519 is an equidigital number, since it uses as much as digits as its factorization.

20501519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 20501519 is about 4527.8603114495. The cubic root of 20501519 is about 273.6919433745.

The spelling of 20501519 in words is "twenty million, five hundred one thousand, five hundred nineteen".