20741687 has 4 divisors (see below), whose sum is σ = 21004320. Its totient is φ = 20479056.

The previous prime is 20741621. The next prime is 20741713. The reversal of 20741687 is 78614702.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20741687 - 2¹⁴ = 20725303 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 (20744687) 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, 131198 + ... + 131355.

It is an arithmetic number, because the mean of its divisors is an integer number (5251080).

Almost surely, 2^20741687 is an apocalyptic number.

20741687 is a deficient number, since it is larger than the sum of its proper divisors (262633).

20741687 is an equidigital number, since it uses as much as digits as its factorization.

20741687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262632.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 20741687 is about 4554.3042278706. The cubic root of 20741687 is about 274.7565316189.

The spelling of 20741687 in words is "twenty million, seven hundred forty-one thousand, six hundred eighty-seven".