20042687 has 8 divisors (see below), whose sum is σ = 23438976. Its totient is φ = 16779672.

The previous prime is 20042669. The next prime is 20042717. The reversal of 20042687 is 78624002.

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

It is not a de Polignac number, because 20042687 - 2²² = 15848383 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 (20042287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32993 + ... + 33594.

It is an arithmetic number, because the mean of its divisors is an integer number (2929872).

Almost surely, 2^20042687 is an apocalyptic number.

20042687 is a deficient number, since it is larger than the sum of its proper divisors (3396289).

20042687 is an equidigital number, since it uses as much as digits as its factorization.

20042687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66637.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 20042687 is about 4476.9059628275. The cubic root of 20042687 is about 271.6347416702.

Adding to 20042687 its reverse (78624002), we get a palindrome (98666689).

The spelling of 20042687 in words is "twenty million, forty-two thousand, six hundred eighty-seven".