20601539 has 8 divisors (see below), whose sum is σ = 23788128. Its totient is φ = 17475840.

The previous prime is 20601533. The next prime is 20601547. The reversal of 20601539 is 93510602.

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 20601539 - 2⁴ = 20601523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20601533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14492 + ... + 15849.

It is an arithmetic number, because the mean of its divisors is an integer number (2973516).

Almost surely, 2^20601539 is an apocalyptic number.

20601539 is a deficient number, since it is larger than the sum of its proper divisors (3186589).

20601539 is an equidigital number, since it uses as much as digits as its factorization.

20601539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30445.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 20601539 is about 4538.8918251044. The cubic root of 20601539 is about 274.1363051018.

The spelling of 20601539 in words is "twenty million, six hundred one thousand, five hundred thirty-nine".