20712129 has 8 divisors (see below), whose sum is σ = 27653472. Its totient is φ = 13789440.

The previous prime is 20712113. The next prime is 20712143. The reversal of 20712129 is 92121702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20712129 - 2⁴ = 20712113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20712099 and 20712108.

It is not an unprimeable number, because it can be changed into a prime (20712199) 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, 1824 + ... + 6689.

It is an arithmetic number, because the mean of its divisors is an integer number (3456684).

Almost surely, 2^20712129 is an apocalyptic number.

20712129 is the 2433-rd nonagonal number.

It is an amenable number.

20712129 is a deficient number, since it is larger than the sum of its proper divisors (6941343).

20712129 is an equidigital number, since it uses as much as digits as its factorization.

20712129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9327.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 20712129 is about 4551.0580088590. The cubic root of 20712129 is about 274.6259553811.

The spelling of 20712129 in words is "twenty million, seven hundred twelve thousand, one hundred twenty-nine".