20013653426765 has 8 divisors (see below), whose sum is σ = 24016408591608. Its totient is φ = 16010906421760.

The previous prime is 20013653426749. The next prime is 20013653426843. The reversal of 20013653426765 is 56762435631002.

It can be written as a sum of positive squares in 4 ways, for example, as 9134593477801 + 10879059948964 = 3022349^2 + 3298342^2 .

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

It is not a de Polignac number, because 20013653426765 - 2⁴ = 20013653426749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6988805 + ... + 9427125.

It is an arithmetic number, because the mean of its divisors is an integer number (3002051073951).

Almost surely, 2^{20013653426765} is an apocalyptic number.

It is an amenable number.

20013653426765 is a deficient number, since it is larger than the sum of its proper divisors (4002755164843).

20013653426765 is a wasteful number, since it uses less digits than its factorization.

20013653426765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4079919.

The product of its (nonzero) digits is 5443200, while the sum is 50.

The spelling of 20013653426765 in words is "twenty trillion, thirteen billion, six hundred fifty-three million, four hundred twenty-six thousand, seven hundred sixty-five".