20213311031 has 4 divisors (see below), whose sum is σ = 20594694312. Its totient is φ = 19831927752.

The previous prime is 20213310989. The next prime is 20213311039. The reversal of 20213311031 is 13011331202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13011331202 = 2 ⋅6505665601.

It is a cyclic number.

It is not a de Polignac number, because 20213311031 - 2¹⁸ = 20213048887 is a prime.

It is a super-2 number, since 2×20213311031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20213311039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190691561 + ... + 190691666.

It is an arithmetic number, because the mean of its divisors is an integer number (5148673578).

Almost surely, 2^20213311031 is an apocalyptic number.

20213311031 is a deficient number, since it is larger than the sum of its proper divisors (381383281).

20213311031 is an equidigital number, since it uses as much as digits as its factorization.

20213311031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381383280.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 20213311031 its reverse (13011331202), we get a palindrome (33224642233).

The spelling of 20213311031 in words is "twenty billion, two hundred thirteen million, three hundred eleven thousand, thirty-one".