20129187 has 16 divisors (see below), whose sum is σ = 29189888. Its totient is φ = 12264480.

The previous prime is 20129167. The next prime is 20129251. The reversal of 20129187 is 78192102.

It is not a de Polignac number, because 20129187 - 2⁷ = 20129059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20129167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1512 + ... + 6522.

It is an arithmetic number, because the mean of its divisors is an integer number (1824368).

Almost surely, 2^20129187 is an apocalyptic number.

20129187 is a deficient number, since it is larger than the sum of its proper divisors (9060701).

20129187 is a wasteful number, since it uses less digits than its factorization.

20129187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5130.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 20129187 is about 4486.5562517370. The cubic root of 20129187 is about 272.0249535570.

The spelling of 20129187 in words is "twenty million, one hundred twenty-nine thousand, one hundred eighty-seven".