20398513 has 8 divisors (see below), whose sum is σ = 21401280. Its totient is φ = 19415760.

The previous prime is 20398501. The next prime is 20398529. The reversal of 20398513 is 31589302.

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 not a de Polignac number, because 20398513 - 2¹⁷ = 20267441 is a prime.

It is a super-2 number, since 2×20398513² = 832198665222338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20398013) 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, 2895 + ... + 7012.

It is an arithmetic number, because the mean of its divisors is an integer number (2675160).

Almost surely, 2^20398513 is an apocalyptic number.

It is an amenable number.

20398513 is a deficient number, since it is larger than the sum of its proper divisors (1002767).

20398513 is an equidigital number, since it uses as much as digits as its factorization.

20398513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10007.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 20398513 is about 4516.4712995878. The cubic root of 20398513 is about 273.2328024441.

The spelling of 20398513 in words is "twenty million, three hundred ninety-eight thousand, five hundred thirteen".