20670720550 has 12 divisors (see below), whose sum is σ = 38447540316. Its totient is φ = 8268288200.

The previous prime is 20670720493. The next prime is 20670720557. The reversal of 20670720550 is 5502707602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20670720557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 206707156 + ... + 206707255.

It is an arithmetic number, because the mean of its divisors is an integer number (3203961693).

Almost surely, 2^20670720550 is an apocalyptic number.

20670720550 is a deficient number, since it is larger than the sum of its proper divisors (17776819766).

20670720550 is a wasteful number, since it uses less digits than its factorization.

20670720550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413414423 (or 413414418 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 34.

The spelling of 20670720550 in words is "twenty billion, six hundred seventy million, seven hundred twenty thousand, five hundred fifty".