20480280646 has 16 divisors (see below), whose sum is σ = 36319710240. Its totient is φ = 8474598720.

The previous prime is 20480280643. The next prime is 20480280649. The reversal of 20480280646 is 64608208402.

It is an interprime number because it is at equal distance from previous prime (20480280643) and next prime (20480280649).

It is a junction number, because it is equal to n+sod(n) for n = 20480280599 and 20480280608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20480280643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25221615 + ... + 25222426.

It is an arithmetic number, because the mean of its divisors is an integer number (2269981890).

Almost surely, 2^20480280646 is an apocalyptic number.

20480280646 is a deficient number, since it is larger than the sum of its proper divisors (15839429594).

20480280646 is a wasteful number, since it uses less digits than its factorization.

20480280646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50444079.

The product of its (nonzero) digits is 147456, while the sum is 40.

The spelling of 20480280646 in words is "twenty billion, four hundred eighty million, two hundred eighty thousand, six hundred forty-six".