20492587 has 4 divisors (see below), whose sum is σ = 20529936. Its totient is φ = 20455240.

The previous prime is 20492569. The next prime is 20492603. The reversal of 20492587 is 78529402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20492587 is a prime.

It is a super-2 number, since 2×20492587² = 839892243905138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20492567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17839 + ... + 18952.

It is an arithmetic number, because the mean of its divisors is an integer number (5132484).

Almost surely, 2^20492587 is an apocalyptic number.

20492587 is a deficient number, since it is larger than the sum of its proper divisors (37349).

20492587 is an equidigital number, since it uses as much as digits as its factorization.

20492587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37348.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 20492587 is about 4526.8738661465. The cubic root of 20492587 is about 273.6521906852.

The spelling of 20492587 in words is "twenty million, four hundred ninety-two thousand, five hundred eighty-seven".