20398407 has 4 divisors (see below), whose sum is σ = 27197880. Its totient is φ = 13598936.

The previous prime is 20398393. The next prime is 20398409. The reversal of 20398407 is 70489302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20398407 - 2¹⁰ = 20397383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20398409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3399732 + ... + 3399737.

It is an arithmetic number, because the mean of its divisors is an integer number (6799470).

Almost surely, 2^20398407 is an apocalyptic number.

20398407 is a deficient number, since it is larger than the sum of its proper divisors (6799473).

20398407 is an equidigital number, since it uses as much as digits as its factorization.

20398407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6799472.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 20398407 is about 4516.4595647476. The cubic root of 20398407 is about 273.2323291624.

The spelling of 20398407 in words is "twenty million, three hundred ninety-eight thousand, four hundred seven".