20531001 has 8 divisors (see below), whose sum is σ = 28815520. Its totient is φ = 12966912.

The previous prime is 20530987. The next prime is 20531023. The reversal of 20531001 is 10013502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20531001 - 2⁵ = 20530969 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20531501) 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 7 ways as a sum of consecutive naturals, for example, 180040 + ... + 180153.

It is an arithmetic number, because the mean of its divisors is an integer number (3601940).

Almost surely, 2^20531001 is an apocalyptic number.

It is an amenable number.

20531001 is a deficient number, since it is larger than the sum of its proper divisors (8284519).

20531001 is a wasteful number, since it uses less digits than its factorization.

20531001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360215.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 20531001 is about 4531.1147634992. The cubic root of 20531001 is about 273.8230738389.

Adding to 20531001 its reverse (10013502), we get a palindrome (30544503).

The spelling of 20531001 in words is "twenty million, five hundred thirty-one thousand, one".