20478766753 has 2 divisors, whose sum is σ = 20478766754. Its totient is φ = 20478766752.

The previous prime is 20478766739. The next prime is 20478766769. The reversal of 20478766753 is 35766787402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19452717729 + 1026049024 = 139473^2 + 32032^2 .

It is a cyclic number.

It is not a de Polignac number, because 20478766753 - 2⁹ = 20478766241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20478766694 and 20478766703.

It is not a weakly prime, because it can be changed into another prime (20478746753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10239383376 + 10239383377.

It is an arithmetic number, because the mean of its divisors is an integer number (10239383377).

Almost surely, 2^20478766753 is an apocalyptic number.

It is an amenable number.

20478766753 is a deficient number, since it is larger than the sum of its proper divisors (1).

20478766753 is an equidigital number, since it uses as much as digits as its factorization.

20478766753 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11854080, while the sum is 55.

The spelling of 20478766753 in words is "twenty billion, four hundred seventy-eight million, seven hundred sixty-six thousand, seven hundred fifty-three".