20288907720 has 192 divisors, whose sum is σ = 70472488320. Its totient is φ = 5044365312.

The previous prime is 20288907719. The next prime is 20288907763. The reversal of 20288907720 is 2770988202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 639349 + ... + 670331.

It is an arithmetic number, because the mean of its divisors is an integer number (367044210).

Almost surely, 2^20288907720 is an apocalyptic number.

20288907720 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 20288907720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35236244160).

20288907720 is an abundant number, since it is smaller than the sum of its proper divisors (50183580600).

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

20288907720 is a wasteful number, since it uses less digits than its factorization.

20288907720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31124 (or 31117 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The spelling of 20288907720 in words is "twenty billion, two hundred eighty-eight million, nine hundred seven thousand, seven hundred twenty".