20025211500 has 576 divisors, whose sum is σ = 78284344320. Its totient is φ = 4328899200.

The previous prime is 20025211439. The next prime is 20025211517. The reversal of 20025211500 is 511252002.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 34114207 + ... + 34114793.

It is an arithmetic number, because the mean of its divisors is an integer number (135910320).

Almost surely, 2^20025211500 is an apocalyptic number.

20025211500 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 20025211500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39142172160).

20025211500 is an abundant number, since it is smaller than the sum of its proper divisors (58259132820).

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

20025211500 is a wasteful number, since it uses less digits than its factorization.

20025211500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660 (or 623 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

Adding to 20025211500 its reverse (511252002), we get a palindrome (20536463502).

The spelling of 20025211500 in words is "twenty billion, twenty-five million, two hundred eleven thousand, five hundred".