20261871 has 12 divisors (see below), whose sum is σ = 33448272. Its totient is φ = 11578176.

The previous prime is 20261869. The next prime is 20261881. The reversal of 20261871 is 17816202.

It is not a de Polignac number, because 20261871 - 2¹ = 20261869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20261861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 160746 + ... + 160871.

It is an arithmetic number, because the mean of its divisors is an integer number (2787356).

Almost surely, 2^20261871 is an apocalyptic number.

20261871 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20261871 is a deficient number, since it is larger than the sum of its proper divisors (13186401).

20261871 is a wasteful number, since it uses less digits than its factorization.

20261871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321630 (or 321627 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 20261871 is about 4501.3188067499. The cubic root of 20261871 is about 272.6213403441.

The spelling of 20261871 in words is "twenty million, two hundred sixty-one thousand, eight hundred seventy-one".