20486747 has 4 divisors (see below), whose sum is σ = 20834040. Its totient is φ = 20139456.

The previous prime is 20486743. The next prime is 20486777. The reversal of 20486747 is 74768402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74768402 = 2 ⋅37384201.

It is a cyclic number.

It is not a de Polignac number, because 20486747 - 2² = 20486743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20486747.

It is not an unprimeable number, because it can be changed into a prime (20486743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173558 + ... + 173675.

It is an arithmetic number, because the mean of its divisors is an integer number (5208510).

Almost surely, 2^20486747 is an apocalyptic number.

20486747 is a deficient number, since it is larger than the sum of its proper divisors (347293).

20486747 is an equidigital number, since it uses as much as digits as its factorization.

20486747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347292.

The product of its (nonzero) digits is 75264, while the sum is 38.

The square root of 20486747 is about 4526.2287834355. The cubic root of 20486747 is about 273.6261929813.

The spelling of 20486747 in words is "twenty million, four hundred eighty-six thousand, seven hundred forty-seven".