20925471 has 16 divisors (see below), whose sum is σ = 32428800. Its totient is φ = 11754048.

The previous prime is 20925467. The next prime is 20925533. The reversal of 20925471 is 17452902.

It is not a de Polignac number, because 20925471 - 2² = 20925467 is a prime.

It is a super-3 number, since 3×20925471³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20925271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7206 + ... + 9683.

It is an arithmetic number, because the mean of its divisors is an integer number (2026800).

Almost surely, 2^20925471 is an apocalyptic number.

20925471 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20925471 is a deficient number, since it is larger than the sum of its proper divisors (11503329).

20925471 is a wasteful number, since it uses less digits than its factorization.

20925471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16958.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 20925471 is about 4574.4366866315. The cubic root of 20925471 is about 275.5656500366.

The spelling of 20925471 in words is "twenty million, nine hundred twenty-five thousand, four hundred seventy-one".