20257331640765 has 32 divisors (see below), whose sum is σ = 32450772842496. Its totient is φ = 10790901065280.

The previous prime is 20257331640719. The next prime is 20257331640803. The reversal of 20257331640765 is 56704613375202.

It is a happy number.

It is not a de Polignac number, because 20257331640765 - 2¹⁴ = 20257331624381 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66765694 + ... + 67068416.

It is an arithmetic number, because the mean of its divisors is an integer number (1014086651328).

Almost surely, 2^{20257331640765} is an apocalyptic number.

It is an amenable number.

20257331640765 is a deficient number, since it is larger than the sum of its proper divisors (12193441201731).

20257331640765 is a wasteful number, since it uses less digits than its factorization.

20257331640765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308089.

The product of its (nonzero) digits is 6350400, while the sum is 51.

The spelling of 20257331640765 in words is "twenty trillion, two hundred fifty-seven billion, three hundred thirty-one million, six hundred forty thousand, seven hundred sixty-five".