20471129 has 16 divisors (see below), whose sum is σ = 24990720. Its totient is φ = 16390080.

The previous prime is 20471119. The next prime is 20471137. The reversal of 20471129 is 92117402.

It is a de Polignac number, because none of the positive numbers 2^k-20471129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20471098 and 20471107.

It is not an unprimeable number, because it can be changed into a prime (20471119) 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, 4667 + ... + 7919.

It is an arithmetic number, because the mean of its divisors is an integer number (1561920).

Almost surely, 2^20471129 is an apocalyptic number.

20471129 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20471129 is a deficient number, since it is larger than the sum of its proper divisors (4519591).

20471129 is a wasteful number, since it uses less digits than its factorization.

20471129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3320.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 20471129 is about 4524.5031771455. The cubic root of 20471129 is about 273.5566426470.

The spelling of 20471129 in words is "twenty million, four hundred seventy-one thousand, one hundred twenty-nine".