20898129 has 16 divisors (see below), whose sum is σ = 32586752. Its totient is φ = 11663568.

The previous prime is 20898109. The next prime is 20898131. The reversal of 20898129 is 92189802.

It is not a de Polignac number, because 20898129 - 2⁸ = 20897873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20898109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10669 + ... + 12474.

It is an arithmetic number, because the mean of its divisors is an integer number (2036672).

Almost surely, 2^20898129 is an apocalyptic number.

It is an amenable number.

20898129 is a deficient number, since it is larger than the sum of its proper divisors (11688623).

20898129 is a wasteful number, since it uses less digits than its factorization.

20898129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23196.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 20898129 is about 4571.4471450516. The cubic root of 20898129 is about 275.4455762755.

The spelling of 20898129 in words is "twenty million, eight hundred ninety-eight thousand, one hundred twenty-nine".