20531075 has 12 divisors (see below), whose sum is σ = 25877808. Its totient is φ = 16154400.

The previous prime is 20531059. The next prime is 20531089. The reversal of 20531075 is 57013502.

It is not a de Polignac number, because 20531075 - 2⁴ = 20531059 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20531075.

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, 5207 + ... + 8256.

It is an arithmetic number, because the mean of its divisors is an integer number (2156484).

Almost surely, 2^20531075 is an apocalyptic number.

20531075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20531075 is a deficient number, since it is larger than the sum of its proper divisors (5346733).

20531075 is a wasteful number, since it uses less digits than its factorization.

20531075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13534 (or 13529 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 20531075 is about 4531.1229292527. The cubic root of 20531075 is about 273.8234028192.

Adding to 20531075 its reverse (57013502), we get a palindrome (77544577).

The spelling of 20531075 in words is "twenty million, five hundred thirty-one thousand, seventy-five".