20670331 has 4 divisors (see below), whose sum is σ = 22549464. Its totient is φ = 18791200.

The previous prime is 20670313. The next prime is 20670337. The reversal of 20670331 is 13307602.

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 20670331 - 2⁷ = 20670203 is a prime.

It is a super-2 number, since 2×20670331² = 854525167299122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20670337) by changing a digit.

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, 939550 + ... + 939571.

It is an arithmetic number, because the mean of its divisors is an integer number (5637366).

Almost surely, 2^20670331 is an apocalyptic number.

20670331 is a deficient number, since it is larger than the sum of its proper divisors (1879133).

20670331 is a wasteful number, since it uses less digits than its factorization.

20670331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1879132.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 20670331 is about 4546.4635707328. The cubic root of 20670331 is about 274.4410951649.

Adding to 20670331 its reverse (13307602), we get a palindrome (33977933).

The spelling of 20670331 in words is "twenty million, six hundred seventy thousand, three hundred thirty-one".