20506475 has 18 divisors (see below), whose sum is σ = 27953940. Its totient is φ = 14911600.

The previous prime is 20506459. The next prime is 20506487. The reversal of 20506475 is 57460502.

It is not a de Polignac number, because 20506475 - 2⁴ = 20506459 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 365 + ... + 6414.

Almost surely, 2^20506475 is an apocalyptic number.

20506475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20506475 is a deficient number, since it is larger than the sum of its proper divisors (7447465).

20506475 is a wasteful number, since it uses less digits than its factorization.

20506475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6811 (or 6795 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 20506475 is about 4528.4075567466. The cubic root of 20506475 is about 273.7139955289.

Adding to 20506475 its reverse (57460502), we get a palindrome (77966977).

The spelling of 20506475 in words is "twenty million, five hundred six thousand, four hundred seventy-five".