20101013 has 2 divisors, whose sum is σ = 20101014. Its totient is φ = 20101012.

The previous prime is 20101009. The next prime is 20101073. The reversal of 20101013 is 31010102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17960644 + 2140369 = 4238^2 + 1463^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101013 - 2² = 20101009 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20101073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050506 + 10050507.

It is an arithmetic number, because the mean of its divisors is an integer number (10050507).

Almost surely, 2^20101013 is an apocalyptic number.

It is an amenable number.

20101013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101013 is an equidigital number, since it uses as much as digits as its factorization.

20101013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 20101013 is about 4483.4153276269. The cubic root of 20101013 is about 271.8979802304.

Adding to 20101013 its reverse (31010102), we get a palindrome (51111115).

The spelling of 20101013 in words is "twenty million, one hundred one thousand, thirteen".