20492287 has 4 divisors (see below), whose sum is σ = 21383280. Its totient is φ = 19601296.

The previous prime is 20492273. The next prime is 20492321. The reversal of 20492287 is 78229402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78229402 = 2 ⋅39114701.

It is a cyclic number.

It is not a de Polignac number, because 20492287 - 2¹⁵ = 20459519 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20492237) 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, 445462 + ... + 445507.

It is an arithmetic number, because the mean of its divisors is an integer number (5345820).

Almost surely, 2^20492287 is an apocalyptic number.

20492287 is a deficient number, since it is larger than the sum of its proper divisors (890993).

20492287 is an equidigital number, since it uses as much as digits as its factorization.

20492287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890992.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20492287 is about 4526.8407305758. The cubic root of 20492287 is about 273.6508553071.

The spelling of 20492287 in words is "twenty million, four hundred ninety-two thousand, two hundred eighty-seven".