20109655015641 has 81 divisors (see below), whose sum is σ = 32264806911519. Its totient is φ = 12066064762752.

The previous prime is 20109655015627. The next prime is 20109655015663. The reversal of 20109655015641 is 14651055690102.

The square root of 20109655015641 is 4484379.

It is a perfect power (a square), and thus also a powerful number.

20109655015641 is a `hidden beast` number, since 2 + 0 + 1 + 0 + 9 + 6 + 550 + 1 + 56 + 41 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15656305808025 + 4453349207616 = 3956805^2 + 2110296^2 .

It is not a de Polignac number, because 20109655015641 - 2⁵ = 20109655015609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20109655015441) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 5260174656 + ... + 5260178478.

Almost surely, 2^{20109655015641} is an apocalyptic number.

20109655015641 is the 4484379-th square number.

20109655015641 is the 2242190-th centered octagonal number.

It is an amenable number.

20109655015641 is a deficient number, since it is larger than the sum of its proper divisors (12155151895878).

20109655015641 is an frugal number, since it uses more digits than its factorization.

20109655015641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7732 (or 3866 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The spelling of 20109655015641 in words is "twenty trillion, one hundred nine billion, six hundred fifty-five million, fifteen thousand, six hundred forty-one".