20756413787 has 2 divisors, whose sum is σ = 20756413788. Its totient is φ = 20756413786.

The previous prime is 20756413763. The next prime is 20756413831. The reversal of 20756413787 is 78731465702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20756413787 - 2¹² = 20756409691 is a prime.

It is not a weakly prime, because it can be changed into another prime (20756413187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10378206893 + 10378206894.

It is an arithmetic number, because the mean of its divisors is an integer number (10378206894).

Almost surely, 2^20756413787 is an apocalyptic number.

20756413787 is a deficient number, since it is larger than the sum of its proper divisors (1).

20756413787 is an equidigital number, since it uses as much as digits as its factorization.

20756413787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1975680, while the sum is 50.

The spelling of 20756413787 in words is "twenty billion, seven hundred fifty-six million, four hundred thirteen thousand, seven hundred eighty-seven".