20010113261 has 2 divisors, whose sum is σ = 20010113262. Its totient is φ = 20010113260.

The previous prime is 20010113209. The next prime is 20010113329. The reversal of 20010113261 is 16231101002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19625208100 + 384905161 = 140090^2 + 19619^2 .

It is a cyclic number.

It is not a de Polignac number, because 20010113261 - 2¹⁴ = 20010096877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20010110261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005056630 + 10005056631.

It is an arithmetic number, because the mean of its divisors is an integer number (10005056631).

Almost surely, 2^20010113261 is an apocalyptic number.

It is an amenable number.

20010113261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010113261 is an equidigital number, since it uses as much as digits as its factorization.

20010113261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20010113261 its reverse (16231101002), we get a palindrome (36241214263).

The spelling of 20010113261 in words is "twenty billion, ten million, one hundred thirteen thousand, two hundred sixty-one".