20720719449 has 48 divisors (see below), whose sum is σ = 30676973184. Its totient is φ = 13474137600.

The previous prime is 20720719361. The next prime is 20720719489. The reversal of 20720719449 is 94491702702.

It is a happy number.

It is not a de Polignac number, because 20720719449 - 2⁷ = 20720719321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20720719489) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30337462 + ... + 30338144.

It is an arithmetic number, because the mean of its divisors is an integer number (639103608).

Almost surely, 2^20720719449 is an apocalyptic number.

It is an amenable number.

20720719449 is a deficient number, since it is larger than the sum of its proper divisors (9956253735).

20720719449 is a wasteful number, since it uses less digits than its factorization.

20720719449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198 (or 1195 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 20720719449 in words is "twenty billion, seven hundred twenty million, seven hundred nineteen thousand, four hundred forty-nine".