20013124535661 has 16 divisors (see below), whose sum is σ = 27605185704000. Its totient is φ = 12881602395648.

The previous prime is 20013124535659. The next prime is 20013124535681. The reversal of 20013124535661 is 16653542131002.

It is a happy number.

It is not a de Polignac number, because 20013124535661 - 2¹ = 20013124535659 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013124535611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 880711 + ... + 6387636.

It is an arithmetic number, because the mean of its divisors is an integer number (1725324106500).

Almost surely, 2^{20013124535661} is an apocalyptic number.

It is an amenable number.

20013124535661 is a deficient number, since it is larger than the sum of its proper divisors (7592061168339).

20013124535661 is a wasteful number, since it uses less digits than its factorization.

20013124535661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7300028.

The product of its (nonzero) digits is 129600, while the sum is 39.

Adding to 20013124535661 its reverse (16653542131002), we get a palindrome (36666666666663).

The spelling of 20013124535661 in words is "twenty trillion, thirteen billion, one hundred twenty-four million, five hundred thirty-five thousand, six hundred sixty-one".