20271880 has 16 divisors (see below), whose sum is σ = 45611820. Its totient is φ = 8108736.

The previous prime is 20271863. The next prime is 20271883. The reversal of 20271880 is 8817202.

It can be written as a sum of positive squares in 2 ways, for example, as 19660356 + 611524 = 4434^2 + 782^2 .

It is not an unprimeable number, because it can be changed into a prime (20271883) 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, 253359 + ... + 253438.

Almost surely, 2^20271880 is an apocalyptic number.

20271880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20271880 is an abundant number, since it is smaller than the sum of its proper divisors (25339940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20271880 is a wasteful number, since it uses less digits than its factorization.

20271880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506808 (or 506804 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 20271880 is about 4502.4304547655. The cubic root of 20271880 is about 272.6662229681. Note that the first 3 decimals are identical.

The spelling of 20271880 in words is "twenty million, two hundred seventy-one thousand, eight hundred eighty".