20305547550 has 72 divisors (see below), whose sum is σ = 54782788320. Its totient is φ = 5392128000.

The previous prime is 20305547531. The next prime is 20305547579. The reversal of 20305547550 is 5574550302.

20305547550 is a `hidden beast` number, since 2 + 0 + 30 + 554 + 75 + 5 + 0 = 666.

It is a super-2 number, since 2×20305547550² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 13150 + ... + 201950.

It is an arithmetic number, because the mean of its divisors is an integer number (760872060).

Almost surely, 2^20305547550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20305547550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27391394160).

20305547550 is an abundant number, since it is smaller than the sum of its proper divisors (34477240770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20305547550 is a wasteful number, since it uses less digits than its factorization.

20305547550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189058 (or 189050 counting only the distinct ones).

The product of its (nonzero) digits is 105000, while the sum is 36.

The spelling of 20305547550 in words is "twenty billion, three hundred five million, five hundred forty-seven thousand, five hundred fifty".