20271993 has 48 divisors (see below), whose sum is σ = 34667520. Its totient is φ = 10273824.

The previous prime is 20271983. The next prime is 20272009. The reversal of 20271993 is 39917202.

It is not a de Polignac number, because 20271993 - 2⁵ = 20271961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20271983) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 431296 + ... + 431342.

It is an arithmetic number, because the mean of its divisors is an integer number (722240).

Almost surely, 2^20271993 is an apocalyptic number.

20271993 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20271993 is a deficient number, since it is larger than the sum of its proper divisors (14395527).

20271993 is a wasteful number, since it uses less digits than its factorization.

20271993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 20271993 is about 4502.4430035260. The cubic root of 20271993 is about 272.6667296013. Note that the first 3 decimals are identical.

It can be divided in two parts, 2027199 and 3, that added together give a palindrome (2027202).

The spelling of 20271993 in words is "twenty million, two hundred seventy-one thousand, nine hundred ninety-three".