20285129 has 8 divisors (see below), whose sum is σ = 21146112. Its totient is φ = 19437120.

The previous prime is 20285099. The next prime is 20285263. The reversal of 20285129 is 92158202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20285129 is a prime.

It is a super-2 number, since 2×20285129² = 822972917093282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20285729) 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, 17 + ... + 6369.

It is an arithmetic number, because the mean of its divisors is an integer number (2643264).

Almost surely, 2^20285129 is an apocalyptic number.

It is an amenable number.

20285129 is a deficient number, since it is larger than the sum of its proper divisors (860983).

20285129 is a wasteful number, since it uses less digits than its factorization.

20285129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6487.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 20285129 is about 4503.9015308952. The cubic root of 20285129 is about 272.7256117710.

The spelling of 20285129 in words is "twenty million, two hundred eighty-five thousand, one hundred twenty-nine".