20670471 has 10 divisors (see below), whose sum is σ = 30878232. Its totient is φ = 13780260.

The previous prime is 20670467. The next prime is 20670479. The reversal of 20670471 is 17407602.

It is not a de Polignac number, because 20670471 - 2² = 20670467 is a prime.

It is a super-3 number, since 3×20670471³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20670479) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 127515 + ... + 127676.

Almost surely, 2^20670471 is an apocalyptic number.

20670471 is a deficient number, since it is larger than the sum of its proper divisors (10207761).

20670471 is an equidigital number, since it uses as much as digits as its factorization.

20670471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255203 (or 255194 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 20670471 is about 4546.4789672889. The cubic root of 20670471 is about 274.4417147593.

The spelling of 20670471 in words is "twenty million, six hundred seventy thousand, four hundred seventy-one".