20602591 has 8 divisors (see below), whose sum is σ = 21187584. Its totient is φ = 20023800.

The previous prime is 20602583. The next prime is 20602609. The reversal of 20602591 is 19520602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20602591 - 2³ = 20602583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20602511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5646 + ... + 8548.

It is an arithmetic number, because the mean of its divisors is an integer number (2648448).

Almost surely, 2^20602591 is an apocalyptic number.

20602591 is a deficient number, since it is larger than the sum of its proper divisors (584993).

20602591 is a wasteful number, since it uses less digits than its factorization.

20602591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3101.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 20602591 is about 4539.0077109430. The cubic root of 20602591 is about 274.1409712011.

It can be divided in two parts, 206025 and 91, that added together give a square (206116 = 454²).

The spelling of 20602591 in words is "twenty million, six hundred two thousand, five hundred ninety-one".