20778590450 has 24 divisors (see below), whose sum is σ = 38695908720. Its totient is φ = 8301171600.

The previous prime is 20778590447. The next prime is 20778590453. The reversal of 20778590450 is 5409587702.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20778590447) and next prime (20778590453).

It is a junction number, because it is equal to n+sod(n) for n = 20778590395 and 20778590404.

It is not an unprimeable number, because it can be changed into a prime (20778590453) 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 11 ways as a sum of consecutive naturals, for example, 215660 + ... + 296759.

It is an arithmetic number, because the mean of its divisors is an integer number (1612329530).

Almost surely, 2^20778590450 is an apocalyptic number.

20778590450 is a deficient number, since it is larger than the sum of its proper divisors (17917318270).

20778590450 is a wasteful number, since it uses less digits than its factorization.

20778590450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513242 (or 513237 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 47.

The spelling of 20778590450 in words is "twenty billion, seven hundred seventy-eight million, five hundred ninety thousand, four hundred fifty".