20129286 has 8 divisors (see below), whose sum is σ = 40258584. Its totient is φ = 6709760.

The previous prime is 20129269. The next prime is 20129287. The reversal of 20129286 is 68292102.

20129286 is nontrivially palindromic in base 12.

It is a sphenic number, since it is the product of 3 distinct primes.

20129286 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20129287) 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, 1677435 + ... + 1677446.

It is an arithmetic number, because the mean of its divisors is an integer number (5032323).

Almost surely, 2^20129286 is an apocalyptic number.

20129286 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20129286 is a wasteful number, since it uses less digits than its factorization.

20129286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3354886.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20129286 is about 4486.5672846844. The cubic root of 20129286 is about 272.0253995168.

The spelling of 20129286 in words is "twenty million, one hundred twenty-nine thousand, two hundred eighty-six".