20913471 has 40 divisors (see below), whose sum is σ = 33454080. Its totient is φ = 12982032.

The previous prime is 20913469. The next prime is 20913479. The reversal of 20913471 is 17431902.

It is not a de Polignac number, because 20913471 - 2¹ = 20913469 is a prime.

It is a super-3 number, since 3×20913471³ (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 (20913479) 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 39 ways as a sum of consecutive naturals, for example, 164610 + ... + 164736.

It is an arithmetic number, because the mean of its divisors is an integer number (836352).

Almost surely, 2^20913471 is an apocalyptic number.

20913471 is a deficient number, since it is larger than the sum of its proper divisors (12540609).

20913471 is a wasteful number, since it uses less digits than its factorization.

20913471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 20913471 is about 4573.1248616236. The cubic root of 20913471 is about 275.5129643231.

The spelling of 20913471 in words is "twenty million, nine hundred thirteen thousand, four hundred seventy-one".