20693569 has 4 divisors (see below), whose sum is σ = 22285396. Its totient is φ = 19101744.

The previous prime is 20693551. The next prime is 20693591. The reversal of 20693569 is 96539602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4892944 + 15800625 = 2212^2 + 3975^2 .

It is a cyclic number.

It is not a de Polignac number, because 20693569 - 2¹³ = 20685377 is a prime.

It is a super-2 number, since 2×20693569² = 856447595915522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20693509) 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 in 3 ways as a sum of consecutive naturals, for example, 795894 + ... + 795919.

It is an arithmetic number, because the mean of its divisors is an integer number (5571349).

Almost surely, 2^20693569 is an apocalyptic number.

It is an amenable number.

20693569 is a deficient number, since it is larger than the sum of its proper divisors (1591827).

20693569 is a wasteful number, since it uses less digits than its factorization.

20693569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591826.

The product of its (nonzero) digits is 87480, while the sum is 40.

The square root of 20693569 is about 4549.0184655594. The cubic root of 20693569 is about 274.5439007073.

The spelling of 20693569 in words is "twenty million, six hundred ninety-three thousand, five hundred sixty-nine".