20270399 has 4 divisors (see below), whose sum is σ = 20288664. Its totient is φ = 20252136.

The previous prime is 20270389. The next prime is 20270417. The reversal of 20270399 is 99307202.

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 20270399 - 2⁸ = 20270143 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 (20270389) 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, 7352 + ... + 9725.

It is an arithmetic number, because the mean of its divisors is an integer number (5072166).

Almost surely, 2^20270399 is an apocalyptic number.

20270399 is a deficient number, since it is larger than the sum of its proper divisors (18265).

20270399 is a wasteful number, since it uses less digits than its factorization.

20270399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18264.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 20270399 is about 4502.2659850346. The cubic root of 20270399 is about 272.6595827599.

The spelling of 20270399 in words is "twenty million, two hundred seventy thousand, three hundred ninety-nine".