20487475 has 6 divisors (see below), whose sum is σ = 25404500. Its totient is φ = 16389960.

The previous prime is 20487473. The next prime is 20487487. The reversal of 20487475 is 57478402.

It is not a de Polignac number, because 20487475 - 2¹ = 20487473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20487473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 409725 + ... + 409774.

Almost surely, 2^20487475 is an apocalyptic number.

20487475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20487475 is a deficient number, since it is larger than the sum of its proper divisors (4917025).

20487475 is an equidigital number, since it uses as much as digits as its factorization.

20487475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819509 (or 819504 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 37.

The square root of 20487475 is about 4526.3092028716. The cubic root of 20487475 is about 273.6294340605.

The spelling of 20487475 in words is "twenty million, four hundred eighty-seven thousand, four hundred seventy-five".