20642487 has 8 divisors (see below), whose sum is σ = 27563520. Its totient is φ = 13741560.

The previous prime is 20642467. The next prime is 20642509. The reversal of 20642487 is 78424602.

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

It is not a de Polignac number, because 20642487 - 2⁶ = 20642423 is a prime.

It is a super-2 number, since 2×20642487² = 852224539090338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20642467) 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, 2439 + ... + 6872.

It is an arithmetic number, because the mean of its divisors is an integer number (3445440).

Almost surely, 2^20642487 is an apocalyptic number.

20642487 is a deficient number, since it is larger than the sum of its proper divisors (6921033).

20642487 is an equidigital number, since it uses as much as digits as its factorization.

20642487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10053.

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 20642487 is about 4543.4003785711. The cubic root of 20642487 is about 274.3178110303.

The spelling of 20642487 in words is "twenty million, six hundred forty-two thousand, four hundred eighty-seven".