20887129 has 8 divisors (see below), whose sum is σ = 21909888. Its totient is φ = 19888560.

The previous prime is 20887109. The next prime is 20887133. The reversal of 20887129 is 92178802.

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 20887129 - 2⁷ = 20887001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20887109) 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, 4267 + ... + 7744.

It is an arithmetic number, because the mean of its divisors is an integer number (2738736).

Almost surely, 2^20887129 is an apocalyptic number.

It is an amenable number.

20887129 is a deficient number, since it is larger than the sum of its proper divisors (1022759).

20887129 is a wasteful number, since it uses less digits than its factorization.

20887129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12095.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 20887129 is about 4570.2438665787. The cubic root of 20887129 is about 275.3972396819.

The spelling of 20887129 in words is "twenty million, eight hundred eighty-seven thousand, one hundred twenty-nine".