20425399 has 4 divisors (see below), whose sum is σ = 21500440. Its totient is φ = 19350360.

The previous prime is 20425397. The next prime is 20425417. The reversal of 20425399 is 99352402.

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

It is not a de Polignac number, because 20425399 - 2¹ = 20425397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20425397) 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, 537492 + ... + 537529.

It is an arithmetic number, because the mean of its divisors is an integer number (5375110).

Almost surely, 2^20425399 is an apocalyptic number.

20425399 is a deficient number, since it is larger than the sum of its proper divisors (1075041).

20425399 is a wasteful number, since it uses less digits than its factorization.

20425399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075040.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 20425399 is about 4519.4467581774. The cubic root of 20425399 is about 273.3527934126.

The spelling of 20425399 in words is "twenty million, four hundred twenty-five thousand, three hundred ninety-nine".