20812014581 has 2 divisors, whose sum is σ = 20812014582. Its totient is φ = 20812014580.

The previous prime is 20812014569. The next prime is 20812014593. The reversal of 20812014581 is 18541021802.

It is a balanced prime because it is at equal distance from previous prime (20812014569) and next prime (20812014593).

It can be written as a sum of positive squares in only one way, i.e., 19723674481 + 1088340100 = 140441^2 + 32990^2 .

It is a cyclic number.

It is not a de Polignac number, because 20812014581 - 2¹⁰ = 20812013557 is a prime.

It is a super-2 number, since 2×20812014581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20812014511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10406007290 + 10406007291.

It is an arithmetic number, because the mean of its divisors is an integer number (10406007291).

Almost surely, 2^20812014581 is an apocalyptic number.

It is an amenable number.

20812014581 is a deficient number, since it is larger than the sum of its proper divisors (1).

20812014581 is an equidigital number, since it uses as much as digits as its factorization.

20812014581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5120, while the sum is 32.

The spelling of 20812014581 in words is "twenty billion, eight hundred twelve million, fourteen thousand, five hundred eighty-one".