20712829 has 2 divisors, whose sum is σ = 20712830. Its totient is φ = 20712828.

The previous prime is 20712823. The next prime is 20712841. The reversal of 20712829 is 92821702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14822500 + 5890329 = 3850^2 + 2427^2 .

It is a cyclic number.

It is not a de Polignac number, because 20712829 - 2²¹ = 18615677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20712829.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20712823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10356414 + 10356415.

It is an arithmetic number, because the mean of its divisors is an integer number (10356415).

Almost surely, 2^20712829 is an apocalyptic number.

It is an amenable number.

20712829 is a deficient number, since it is larger than the sum of its proper divisors (1).

20712829 is an equidigital number, since it uses as much as digits as its factorization.

20712829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20712829 is about 4551.1349134035. The cubic root of 20712829 is about 274.6290491562.

It can be divided in two parts, 2071 and 2829, that added together give a square (4900 = 70²).

The spelling of 20712829 in words is "twenty million, seven hundred twelve thousand, eight hundred twenty-nine".