20545829 has 2 divisors, whose sum is σ = 20545830. Its totient is φ = 20545828.

The previous prime is 20545817. The next prime is 20545871. The reversal of 20545829 is 92854502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17222500 + 3323329 = 4150^2 + 1823^2 .

It is a cyclic number.

It is not a de Polignac number, because 20545829 - 2⁸ = 20545573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20505829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10272914 + 10272915.

It is an arithmetic number, because the mean of its divisors is an integer number (10272915).

Almost surely, 2^20545829 is an apocalyptic number.

It is an amenable number.

20545829 is a deficient number, since it is larger than the sum of its proper divisors (1).

20545829 is an equidigital number, since it uses as much as digits as its factorization.

20545829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 20545829 is about 4532.7507101097. The cubic root of 20545829 is about 273.8889785888. Note that the first 3 decimals are identical.

The spelling of 20545829 in words is "twenty million, five hundred forty-five thousand, eight hundred twenty-nine".