20001575 has 12 divisors (see below), whose sum is σ = 27057048. Its totient is φ = 14546400.

The previous prime is 20001557. The next prime is 20001613. The reversal of 20001575 is 57510002.

It is not a de Polignac number, because 20001575 - 2¹⁴ = 19985191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36092 + ... + 36641.

It is an arithmetic number, because the mean of its divisors is an integer number (2254754).

Almost surely, 2^20001575 is an apocalyptic number.

20001575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20001575 is a deficient number, since it is larger than the sum of its proper divisors (7055473).

20001575 is a wasteful number, since it uses less digits than its factorization.

20001575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72754 (or 72749 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 20001575 is about 4472.3120418862. The cubic root of 20001575 is about 271.4488868187.

Adding to 20001575 its reverse (57510002), we get a palindrome (77511577).

The spelling of 20001575 in words is "twenty million, one thousand, five hundred seventy-five".