20459629 has 2 divisors, whose sum is σ = 20459630. Its totient is φ = 20459628.

The previous prime is 20459623. The next prime is 20459651. The reversal of 20459629 is 92695402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17867529 + 2592100 = 4227^2 + 1610^2 .

It is a cyclic number.

It is not a de Polignac number, because 20459629 - 2¹³ = 20451437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20459623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10229814 + 10229815.

It is an arithmetic number, because the mean of its divisors is an integer number (10229815).

Almost surely, 2^20459629 is an apocalyptic number.

It is an amenable number.

20459629 is a deficient number, since it is larger than the sum of its proper divisors (1).

20459629 is an equidigital number, since it uses as much as digits as its factorization.

20459629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 20459629 is about 4523.2321408480. The cubic root of 20459629 is about 273.5054080414.

The spelling of 20459629 in words is "twenty million, four hundred fifty-nine thousand, six hundred twenty-nine".