20732605 has 16 divisors (see below), whose sum is σ = 26535600. Its totient is φ = 15496192.

The previous prime is 20732603. The next prime is 20732611. The reversal of 20732605 is 50623702.

It can be written as a sum of positive squares in 8 ways, for example, as 3865156 + 16867449 = 1966^2 + 4107^2 .

It is a cyclic number.

It is not a de Polignac number, because 20732605 - 2¹ = 20732603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20732605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20732603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11847 + ... + 13483.

It is an arithmetic number, because the mean of its divisors is an integer number (1658475).

Almost surely, 2^20732605 is an apocalyptic number.

It is an amenable number.

20732605 is a deficient number, since it is larger than the sum of its proper divisors (5802995).

20732605 is a wasteful number, since it uses less digits than its factorization.

20732605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20732605 is about 4553.3070399436. The cubic root of 20732605 is about 274.7164239344.

The spelling of 20732605 in words is "twenty million, seven hundred thirty-two thousand, six hundred five".