20885629 has 2 divisors, whose sum is σ = 20885630. Its totient is φ = 20885628.

The previous prime is 20885621. The next prime is 20885663. The reversal of 20885629 is 92658802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20884900 + 729 = 4570^2 + 27^2 .

It is a cyclic number.

It is not a de Polignac number, because 20885629 - 2³ = 20885621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20885591 and 20885600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20885621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10442814 + 10442815.

It is an arithmetic number, because the mean of its divisors is an integer number (10442815).

Almost surely, 2^20885629 is an apocalyptic number.

It is an amenable number.

20885629 is a deficient number, since it is larger than the sum of its proper divisors (1).

20885629 is an equidigital number, since it uses as much as digits as its factorization.

20885629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 20885629 is about 4570.0797586038. The cubic root of 20885629 is about 275.3906470135.

The spelling of 20885629 in words is "twenty million, eight hundred eighty-five thousand, six hundred twenty-nine".