20531211 has 8 divisors (see below), whose sum is σ = 27418320. Its totient is φ = 13665792.

The previous prime is 20531183. The next prime is 20531213. The reversal of 20531211 is 11213502.

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

It is not a de Polignac number, because 20531211 - 2¹⁹ = 20006923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20531213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3066 + ... + 7103.

It is an arithmetic number, because the mean of its divisors is an integer number (3427290).

Almost surely, 2^20531211 is an apocalyptic number.

20531211 is a deficient number, since it is larger than the sum of its proper divisors (6887109).

20531211 is a wasteful number, since it uses less digits than its factorization.

20531211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10845.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 20531211 is about 4531.1379365453. The cubic root of 20531211 is about 273.8240074295.

Adding to 20531211 its reverse (11213502), we get a palindrome (31744713).

The spelling of 20531211 in words is "twenty million, five hundred thirty-one thousand, two hundred eleven".