20487129 has 16 divisors (see below), whose sum is σ = 29502144. Its totient is φ = 12571200.

The previous prime is 20487119. The next prime is 20487157. The reversal of 20487129 is 92178402.

It is a happy number.

It is not a de Polignac number, because 20487129 - 2⁴ = 20487113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20487129.

It is not an unprimeable number, because it can be changed into a prime (20487109) 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, 20614 + ... + 21584.

It is an arithmetic number, because the mean of its divisors is an integer number (1843884).

Almost surely, 2^20487129 is an apocalyptic number.

It is an amenable number.

20487129 is a deficient number, since it is larger than the sum of its proper divisors (9015015).

20487129 is a wasteful number, since it uses less digits than its factorization.

20487129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 20487129 is about 4526.2709817244. The cubic root of 20487129 is about 273.6278936670.

The spelling of 20487129 in words is "twenty million, four hundred eighty-seven thousand, one hundred twenty-nine".