20471925 has 12 divisors (see below), whose sum is σ = 33847040. Its totient is φ = 10918320.

The previous prime is 20471923. The next prime is 20471933. The reversal of 20471925 is 52917402.

It is not a de Polignac number, because 20471925 - 2¹ = 20471923 is a prime.

It is a super-3 number, since 3×20471925³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20471892 and 20471901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20471923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136405 + ... + 136554.

Almost surely, 2^20471925 is an apocalyptic number.

20471925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20471925 is a deficient number, since it is larger than the sum of its proper divisors (13375115).

20471925 is a wasteful number, since it uses less digits than its factorization.

20471925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272972 (or 272967 counting only the distinct ones).

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

The square root of 20471925 is about 4524.5911417497. The cubic root of 20471925 is about 273.5601882627.

The spelling of 20471925 in words is "twenty million, four hundred seventy-one thousand, nine hundred twenty-five".