20605129 has 8 divisors (see below), whose sum is σ = 21391488. Its totient is φ = 19833360.

The previous prime is 20605099. The next prime is 20605147. The reversal of 20605129 is 92150602.

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

It is a cyclic number.

It is not a de Polignac number, because 20605129 - 2²¹ = 18507977 is a prime.

It is a super-2 number, since 2×20605129² = 849142682213282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20605159) 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, 727 + ... + 6460.

It is an arithmetic number, because the mean of its divisors is an integer number (2673936).

Almost surely, 2^20605129 is an apocalyptic number.

It is an amenable number.

20605129 is a deficient number, since it is larger than the sum of its proper divisors (786359).

20605129 is an equidigital number, since it uses as much as digits as its factorization.

20605129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7295.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 20605129 is about 4539.2872788578. The cubic root of 20605129 is about 274.1522277338.

The spelling of 20605129 in words is "twenty million, six hundred five thousand, one hundred twenty-nine".