20671004 has 12 divisors (see below), whose sum is σ = 36787800. Its totient is φ = 10160208.

The previous prime is 20670989. The next prime is 20671019. The reversal of 20671004 is 40017602.

It is an interprime number because it is at equal distance from previous prime (20670989) and next prime (20671019).

It is a congruent number.

It is an unprimeable number.

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, 43559 + ... + 44030.

It is an arithmetic number, because the mean of its divisors is an integer number (3065650).

Almost surely, 2^20671004 is an apocalyptic number.

It is an amenable number.

20671004 is a deficient number, since it is larger than the sum of its proper divisors (16116796).

20671004 is a wasteful number, since it uses less digits than its factorization.

20671004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87652 (or 87650 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 20671004 is about 4546.5375837004. The cubic root of 20671004 is about 274.4440736183. Note that the first 3 decimals are identical.

Adding to 20671004 its reverse (40017602), we get a palindrome (60688606).

The spelling of 20671004 in words is "twenty million, six hundred seventy-one thousand, four".