20671913 has 8 divisors (see below), whose sum is σ = 21237216. Its totient is φ = 20109600.

The previous prime is 20671907. The next prime is 20671919. The reversal of 20671913 is 31917602.

It is an interprime number because it is at equal distance from previous prime (20671907) and next prime (20671919).

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

It is a cyclic number.

It is not a de Polignac number, because 20671913 - 2¹⁰ = 20670889 is a prime.

It is a super-3 number, since 3×20671913³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20671919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22970 + ... + 23852.

It is an arithmetic number, because the mean of its divisors is an integer number (2654652).

Almost surely, 2^20671913 is an apocalyptic number.

It is an amenable number.

20671913 is a deficient number, since it is larger than the sum of its proper divisors (565303).

20671913 is an equidigital number, since it uses as much as digits as its factorization.

20671913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 20671913 is about 4546.6375487826. The cubic root of 20671913 is about 274.4480964193.

The spelling of 20671913 in words is "twenty million, six hundred seventy-one thousand, nine hundred thirteen".