20129827 has 4 divisors (see below), whose sum is σ = 20183320. Its totient is φ = 20076336.

The previous prime is 20129789. The next prime is 20129833. The reversal of 20129827 is 72892102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72892102 = 2 ⋅36446051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20129827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20129897) 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, 26178 + ... + 26935.

It is an arithmetic number, because the mean of its divisors is an integer number (5045830).

Almost surely, 2^20129827 is an apocalyptic number.

20129827 is a deficient number, since it is larger than the sum of its proper divisors (53493).

20129827 is an equidigital number, since it uses as much as digits as its factorization.

20129827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53492.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20129827 is about 4486.6275753621. The cubic root of 20129827 is about 272.0278365038.

The spelling of 20129827 in words is "twenty million, one hundred twenty-nine thousand, eight hundred twenty-seven".