20454986 has 8 divisors (see below), whose sum is σ = 30710340. Its totient is φ = 10218208.

The previous prime is 20454983. The next prime is 20454989. The reversal of 20454986 is 68945402.

It is an interprime number because it is at equal distance from previous prime (20454983) and next prime (20454989).

It can be written as a sum of positive squares in 2 ways, for example, as 19971961 + 483025 = 4469^2 + 695^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20454983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1451 + ... + 6558.

Almost surely, 2^20454986 is an apocalyptic number.

20454986 is a deficient number, since it is larger than the sum of its proper divisors (10255354).

20454986 is a wasteful number, since it uses less digits than its factorization.

20454986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9288.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 20454986 is about 4522.7188725367. The cubic root of 20454986 is about 273.4847171859.

The spelling of 20454986 in words is "twenty million, four hundred fifty-four thousand, nine hundred eighty-six".