20271999 has 16 divisors (see below), whose sum is σ = 30207744. Its totient is φ = 11985600.

The previous prime is 20271983. The next prime is 20272009. The reversal of 20271999 is 99917202.

It is a happy number.

It is not a de Polignac number, because 20271999 - 2⁴ = 20271983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20271919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6139 + ... + 8844.

It is an arithmetic number, because the mean of its divisors is an integer number (1887984).

Almost surely, 2^20271999 is an apocalyptic number.

20271999 is a deficient number, since it is larger than the sum of its proper divisors (9935745).

20271999 is a wasteful number, since it uses less digits than its factorization.

20271999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15038.

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 20271999 is about 4502.4436698309. The cubic root of 20271999 is about 272.6667565022. Note that the first 3 decimals are identical.

The spelling of 20271999 in words is "twenty million, two hundred seventy-one thousand, nine hundred ninety-nine".