20555765770 has 16 divisors (see below), whose sum is σ = 37002043368. Its totient is φ = 8221936320.

The previous prime is 20555765759. The next prime is 20555765803. The reversal of 20555765770 is 7756755502.

It can be written as a sum of positive squares in 4 ways, for example, as 20187010561 + 368755209 = 142081^2 + 19203^2 .

It is a super-2 number, since 2×20555765770² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 343480 + ... + 398860.

Almost surely, 2^20555765770 is an apocalyptic number.

20555765770 is a deficient number, since it is larger than the sum of its proper divisors (16446277598).

20555765770 is a wasteful number, since it uses less digits than its factorization.

20555765770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92505.

The product of its (nonzero) digits is 2572500, while the sum is 49.

The spelling of 20555765770 in words is "twenty billion, five hundred fifty-five million, seven hundred sixty-five thousand, seven hundred seventy".