20242759681 has 8 divisors (see below), whose sum is σ = 20860827624. Its totient is φ = 19628426880.

The previous prime is 20242759637. The next prime is 20242759709. The reversal of 20242759681 is 18695724202.

It can be written as a sum of positive squares in 4 ways, for example, as 13874719681 + 6368040000 = 117791^2 + 79800^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20242759681 - 2⁹ = 20242759169 is a prime.

It is a super-2 number, since 2×20242759681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20242759081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 922780 + ... + 944461.

It is an arithmetic number, because the mean of its divisors is an integer number (2607603453).

It is a Proth number, since it is equal to 19305 ⋅ 2²⁰ + 1 and 19305 < 2²⁰.

Almost surely, 2^20242759681 is an apocalyptic number.

It is an amenable number.

20242759681 is a deficient number, since it is larger than the sum of its proper divisors (618067943).

20242759681 is a wasteful number, since it uses less digits than its factorization.

20242759681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867571.

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 20242759681 in words is "twenty billion, two hundred forty-two million, seven hundred fifty-nine thousand, six hundred eighty-one".