20502407747 has 2 divisors, whose sum is σ = 20502407748. Its totient is φ = 20502407746.

The previous prime is 20502407743. The next prime is 20502407777. The reversal of 20502407747 is 74770420502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20502407747 - 2² = 20502407743 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20502407747.

It is not a weakly prime, because it can be changed into another prime (20502407743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10251203873 + 10251203874.

It is an arithmetic number, because the mean of its divisors is an integer number (10251203874).

Almost surely, 2^20502407747 is an apocalyptic number.

20502407747 is a deficient number, since it is larger than the sum of its proper divisors (1).

20502407747 is an equidigital number, since it uses as much as digits as its factorization.

20502407747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 109760, while the sum is 38.

The spelling of 20502407747 in words is "twenty billion, five hundred two million, four hundred seven thousand, seven hundred forty-seven".