20125519 has 2 divisors, whose sum is σ = 20125520. Its totient is φ = 20125518.

The previous prime is 20125517. The next prime is 20125537. The reversal of 20125519 is 91552102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20125519 - 2¹ = 20125517 is a prime.

It is a super-2 number, since 2×20125519² = 810073030038722, which contains 22 as substring.

Together with 20125517, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20125493 and 20125502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20125513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10062759 + 10062760.

It is an arithmetic number, because the mean of its divisors is an integer number (10062760).

Almost surely, 2^20125519 is an apocalyptic number.

20125519 is a deficient number, since it is larger than the sum of its proper divisors (1).

20125519 is an equidigital number, since it uses as much as digits as its factorization.

20125519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 20125519 is about 4486.1474563371. The cubic root of 20125519 is about 272.0084294893.

The spelling of 20125519 in words is "twenty million, one hundred twenty-five thousand, five hundred nineteen".