20402650703581 has 4 divisors (see below), whose sum is σ = 20407016779452. Its totient is φ = 20398284627712.

The previous prime is 20402650703551. The next prime is 20402650703587. The reversal of 20402650703581 is 18530705620402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14232767297956 + 6169883405625 = 3772634^2 + 2483925^2 .

It is a cyclic number.

It is not a de Polignac number, because 20402650703581 - 2⁷ = 20402650703453 is a prime.

It is a super-2 number, since 2×20402650703581² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402650703587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2183030926 + ... + 2183040271.

It is an arithmetic number, because the mean of its divisors is an integer number (5101754194863).

Almost surely, 2^{20402650703581} is an apocalyptic number.

It is an amenable number.

20402650703581 is a deficient number, since it is larger than the sum of its proper divisors (4366075871).

20402650703581 is an equidigital number, since it uses as much as digits as its factorization.

20402650703581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4366075870.

The product of its (nonzero) digits is 403200, while the sum is 43.

The spelling of 20402650703581 in words is "twenty trillion, four hundred two billion, six hundred fifty million, seven hundred three thousand, five hundred eighty-one".