20018519 has 8 divisors (see below), whose sum is σ = 20278272. Its totient is φ = 19760760.

The previous prime is 20018491. The next prime is 20018527. The reversal of 20018519 is 91581002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20018519 is a prime.

It is a super-2 number, since 2×20018519² = 801482205906722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20018819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30812 + ... + 31454.

It is an arithmetic number, because the mean of its divisors is an integer number (2534784).

Almost surely, 2^20018519 is an apocalyptic number.

20018519 is a deficient number, since it is larger than the sum of its proper divisors (259753).

20018519 is a wasteful number, since it uses less digits than its factorization.

20018519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 20018519 is about 4474.2059630732. The cubic root of 20018519 is about 271.5255163137.

The spelling of 20018519 in words is "twenty million, eighteen thousand, five hundred nineteen".