20670458 has 8 divisors (see below), whose sum is σ = 31312980. Its totient is φ = 10232800.

The previous prime is 20670449. The next prime is 20670467. The reversal of 20670458 is 85407602.

It is an interprime number because it is at equal distance from previous prime (20670449) and next prime (20670467).

It can be written as a sum of positive squares in 2 ways, for example, as 20133169 + 537289 = 4487^2 + 733^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50963 + ... + 51366.

Almost surely, 2^20670458 is an apocalyptic number.

20670458 is a deficient number, since it is larger than the sum of its proper divisors (10642522).

20670458 is a wasteful number, since it uses less digits than its factorization.

20670458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102432.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 20670458 is about 4546.4775376108. The cubic root of 20670458 is about 274.4416572257.

The spelling of 20670458 in words is "twenty million, six hundred seventy thousand, four hundred fifty-eight".