20778590403 has 12 divisors (see below), whose sum is σ = 30279127320. Its totient is φ = 13729805376.

The previous prime is 20778590401. The next prime is 20778590431. The reversal of 20778590403 is 30409587702.

It is not a de Polignac number, because 20778590403 - 2¹ = 20778590401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20778590401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10214613 + ... + 10216646.

It is an arithmetic number, because the mean of its divisors is an integer number (2523260610).

Almost surely, 2^20778590403 is an apocalyptic number.

20778590403 is a deficient number, since it is larger than the sum of its proper divisors (9500536917).

20778590403 is a wasteful number, since it uses less digits than its factorization.

20778590403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20431378 (or 20431375 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 20778590403 in words is "twenty billion, seven hundred seventy-eight million, five hundred ninety thousand, four hundred three".