20700007476787 has 2 divisors, whose sum is σ = 20700007476788. Its totient is φ = 20700007476786.

The previous prime is 20700007476683. The next prime is 20700007476833. The reversal of 20700007476787 is 78767470000702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20700007476787 is a prime.

It is not a weakly prime, because it can be changed into another prime (20700007473787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10350003738393 + 10350003738394.

It is an arithmetic number, because the mean of its divisors is an integer number (10350003738394).

Almost surely, 2^{20700007476787} is an apocalyptic number.

20700007476787 is a deficient number, since it is larger than the sum of its proper divisors (1).

20700007476787 is an equidigital number, since it uses as much as digits as its factorization.

20700007476787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6453888, while the sum is 55.

The spelling of 20700007476787 in words is "twenty trillion, seven hundred billion, seven million, four hundred seventy-six thousand, seven hundred eighty-seven".