20000555217 has 24 divisors (see below), whose sum is σ = 29108387880. Its totient is φ = 13233104640.

The previous prime is 20000555209. The next prime is 20000555291. The reversal of 20000555217 is 71255500002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18773384256 + 1227170961 = 137016^2 + 35031^2 .

It is not a de Polignac number, because 20000555217 - 2³ = 20000555209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20000556217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 711367 + ... + 738947.

It is an arithmetic number, because the mean of its divisors is an integer number (1212849495).

Almost surely, 2^20000555217 is an apocalyptic number.

It is an amenable number.

20000555217 is a deficient number, since it is larger than the sum of its proper divisors (9107832663).

20000555217 is a wasteful number, since it uses less digits than its factorization.

20000555217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28193 (or 28190 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The spelling of 20000555217 in words is "twenty billion, five hundred fifty-five thousand, two hundred seventeen".