20412871 has 2 divisors, whose sum is σ = 20412872. Its totient is φ = 20412870.

The previous prime is 20412817. The next prime is 20412877. The reversal of 20412871 is 17821402.

It is a happy number.

Together with previous prime (20412817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20412871 - 2¹¹ = 20410823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20412877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10206435 + 10206436.

It is an arithmetic number, because the mean of its divisors is an integer number (10206436).

Almost surely, 2^20412871 is an apocalyptic number.

20412871 is a deficient number, since it is larger than the sum of its proper divisors (1).

20412871 is an equidigital number, since it uses as much as digits as its factorization.

20412871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 20412871 is about 4518.0605352297. The cubic root of 20412871 is about 273.2968946401.

The spelling of 20412871 in words is "twenty million, four hundred twelve thousand, eight hundred seventy-one".