20398345 has 8 divisors (see below), whose sum is σ = 26703360. Its totient is φ = 14835120.

The previous prime is 20398333. The next prime is 20398387. The reversal of 20398345 is 54389302.

It is a happy number.

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

It is not a de Polignac number, because 20398345 - 2¹¹ = 20396297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20398345.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185385 + ... + 185494.

It is an arithmetic number, because the mean of its divisors is an integer number (3337920).

Almost surely, 2^20398345 is an apocalyptic number.

It is an amenable number.

20398345 is a deficient number, since it is larger than the sum of its proper divisors (6305015).

20398345 is a wasteful number, since it uses less digits than its factorization.

20398345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370895.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 20398345 is about 4516.4527009590. The cubic root of 20398345 is about 273.2320523365.

The spelling of 20398345 in words is "twenty million, three hundred ninety-eight thousand, three hundred forty-five".