20213031 has 4 divisors (see below), whose sum is σ = 26950712. Its totient is φ = 13475352.

The previous prime is 20212991. The next prime is 20213047. The reversal of 20213031 is 13031202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20213031 - 2¹⁴ = 20196647 is a prime.

It is a super-2 number, since 2×20213031² = 817133244413922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20212998 and 20213016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20213071) 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 3 ways as a sum of consecutive naturals, for example, 3368836 + ... + 3368841.

It is an arithmetic number, because the mean of its divisors is an integer number (6737678).

Almost surely, 2^20213031 is an apocalyptic number.

20213031 is a deficient number, since it is larger than the sum of its proper divisors (6737681).

20213031 is an equidigital number, since it uses as much as digits as its factorization.

20213031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6737680.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 20213031 is about 4495.8904568506. The cubic root of 20213031 is about 272.4021184238.

Adding to 20213031 its reverse (13031202), we get a palindrome (33244233).

The spelling of 20213031 in words is "twenty million, two hundred thirteen thousand, thirty-one".