20781140269351 has 8 divisors (see below), whose sum is σ = 25908954102144. Its totient is φ = 16193096313720.

The previous prime is 20781140269339. The next prime is 20781140269391. The reversal of 20781140269351 is 15396204118702.

It is a happy number.

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 20781140269351 - 2²⁵ = 20781106714919 is a prime.

It is a super-2 number, since 2×20781140269351² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20781140269295 and 20781140269304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20781140269321) 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, 134942469205 + ... + 134942469358.

It is an arithmetic number, because the mean of its divisors is an integer number (3238619262768).

It is a 1-persistent number, because it is pandigital, but 2⋅20781140269351 = 41562280538702 is not.

Almost surely, 2^{20781140269351} is an apocalyptic number.

20781140269351 is a deficient number, since it is larger than the sum of its proper divisors (5127813832793).

20781140269351 is a wasteful number, since it uses less digits than its factorization.

20781140269351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269884938581.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 20781140269351 in words is "twenty trillion, seven hundred eighty-one billion, one hundred forty million, two hundred sixty-nine thousand, three hundred fifty-one".