20655254320 has 80 divisors (see below), whose sum is σ = 51323956128. Its totient is φ = 7703367680.

The previous prime is 20655254317. The next prime is 20655254339. The reversal of 20655254320 is 2345255602.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74550 + ... + 216490.

Almost surely, 2^20655254320 is an apocalyptic number.

20655254320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20655254320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25661978064).

20655254320 is an abundant number, since it is smaller than the sum of its proper divisors (30668701808).

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

20655254320 is a wasteful number, since it uses less digits than its factorization.

20655254320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142078 (or 142072 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

The spelling of 20655254320 in words is "twenty billion, six hundred fifty-five million, two hundred fifty-four thousand, three hundred twenty".