20431200555 has 48 divisors (see below), whose sum is σ = 37296779520. Its totient is φ = 10317927744.

The previous prime is 20431200529. The next prime is 20431200583. The reversal of 20431200555 is 55500213402.

It is a happy number.

20431200555 is a `hidden beast` number, since 20 + 431 + 200 + 5 + 5 + 5 = 666.

It is not a de Polignac number, because 20431200555 - 2⁹ = 20431200043 is a prime.

It is a super-2 number, since 2×20431200555² (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 47 ways as a sum of consecutive naturals, for example, 2135292 + ... + 2144838.

It is an arithmetic number, because the mean of its divisors is an integer number (777016240).

Almost surely, 2^20431200555 is an apocalyptic number.

20431200555 is a deficient number, since it is larger than the sum of its proper divisors (16865578965).

20431200555 is a wasteful number, since it uses less digits than its factorization.

20431200555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12080 (or 12077 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

Adding to 20431200555 its reverse (55500213402), we get a palindrome (75931413957).

The spelling of 20431200555 in words is "twenty billion, four hundred thirty-one million, two hundred thousand, five hundred fifty-five".