20623350555 has 24 divisors (see below), whose sum is σ = 35849595600. Its totient is φ = 10967595840.

The previous prime is 20623350547. The next prime is 20623350569. The reversal of 20623350555 is 55505332602.

20623350555 is a `hidden beast` number, since 20 + 6 + 2 + 33 + 50 + 555 = 666.

It is not a de Polignac number, because 20623350555 - 2³ = 20623350547 is a prime.

It is a super-2 number, since 2×20623350555² (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 23 ways as a sum of consecutive naturals, for example, 640881 + ... + 672290.

It is an arithmetic number, because the mean of its divisors is an integer number (1493733150).

Almost surely, 2^20623350555 is an apocalyptic number.

20623350555 is a deficient number, since it is larger than the sum of its proper divisors (15226245045).

20623350555 is a wasteful number, since it uses less digits than its factorization.

20623350555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313531 (or 1313528 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 36.

The spelling of 20623350555 in words is "twenty billion, six hundred twenty-three million, three hundred fifty thousand, five hundred fifty-five".