20516019 has 8 divisors (see below), whose sum is σ = 28094160. Its totient is φ = 13307616.

The previous prime is 20516009. The next prime is 20516039. The reversal of 20516019 is 91061502.

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

It is not a de Polignac number, because 20516019 - 2¹² = 20511923 is a prime.

It is a super-2 number, since 2×20516019² = 841814071216722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20516019.

It is not an unprimeable number, because it can be changed into a prime (20516009) 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, 92304 + ... + 92525.

It is an arithmetic number, because the mean of its divisors is an integer number (3511770).

Almost surely, 2^20516019 is an apocalyptic number.

20516019 is a deficient number, since it is larger than the sum of its proper divisors (7578141).

20516019 is a wasteful number, since it uses less digits than its factorization.

20516019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184869.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 20516019 is about 4529.4612262387. The cubic root of 20516019 is about 273.7564523823.

The spelling of 20516019 in words is "twenty million, five hundred sixteen thousand, nineteen".