20981327601 has 16 divisors (see below), whose sum is σ = 30134093696. Its totient is φ = 12908560896.

The previous prime is 20981327567. The next prime is 20981327663. The reversal of 20981327601 is 10672318902.

It is not a de Polignac number, because 20981327601 - 2⁷ = 20981327473 is a prime.

It is a super-2 number, since 2×20981327601² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20981327601.

It is not an unprimeable number, because it can be changed into a prime (20981327681) 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, 111681 + ... + 233313.

It is an arithmetic number, because the mean of its divisors is an integer number (1883380856).

Almost surely, 2^20981327601 is an apocalyptic number.

It is an amenable number.

20981327601 is a deficient number, since it is larger than the sum of its proper divisors (9152766095).

20981327601 is a wasteful number, since it uses less digits than its factorization.

20981327601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126072.

The product of its (nonzero) digits is 36288, while the sum is 39.

The spelling of 20981327601 in words is "twenty billion, nine hundred eighty-one million, three hundred twenty-seven thousand, six hundred one".