20504001 has 12 divisors (see below), whose sum is σ = 31802352. Its totient is φ = 11716488.

The previous prime is 20503999. The next prime is 20504009. The reversal of 20504001 is 10040502.

It is not a de Polignac number, because 20504001 - 2¹ = 20503999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20504009) 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 11 ways as a sum of consecutive naturals, for example, 69595 + ... + 69888.

It is an arithmetic number, because the mean of its divisors is an integer number (2650196).

Almost surely, 2^20504001 is an apocalyptic number.

20504001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20504001 is a deficient number, since it is larger than the sum of its proper divisors (11298351).

20504001 is a wasteful number, since it uses less digits than its factorization.

20504001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139500 (or 139493 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 20504001 is about 4528.1343840482. The cubic root of 20504001 is about 273.7029876942.

Adding to 20504001 its reverse (10040502), we get a palindrome (30544503).

The spelling of 20504001 in words is "twenty million, five hundred four thousand, one".