20271956 has 24 divisors (see below), whose sum is σ = 37749096. Its totient is φ = 9492480.

The previous prime is 20271949. The next prime is 20271959. The reversal of 20271956 is 65917202.

It can be written as a sum of positive squares in 4 ways, for example, as 10562500 + 9709456 = 3250^2 + 3116^2 .

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20271959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15770 + ... + 17006.

It is an arithmetic number, because the mean of its divisors is an integer number (1572879).

Almost surely, 2^20271956 is an apocalyptic number.

It is an amenable number.

20271956 is a deficient number, since it is larger than the sum of its proper divisors (17477140).

20271956 is a wasteful number, since it uses less digits than its factorization.

20271956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499 (or 1497 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 20271956 is about 4502.4388946437. The cubic root of 20271956 is about 272.6665637128. Note that the first 3 decimals are identical.

The spelling of 20271956 in words is "twenty million, two hundred seventy-one thousand, nine hundred fifty-six".