20573998380 has 672 divisors, whose sum is σ = 76350859200. Its totient is φ = 4608866304.

The previous prime is 20573998337. The next prime is 20573998381. The reversal of 20573998380 is 8389937502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (20573998381) by changing a digit.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 104436442 + ... + 104436638.

It is an arithmetic number, because the mean of its divisors is an integer number (113617350).

Almost surely, 2^20573998380 is an apocalyptic number.

20573998380 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 20573998380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38175429600).

20573998380 is an abundant number, since it is smaller than the sum of its proper divisors (55776860820).

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

20573998380 is a wasteful number, since it uses less digits than its factorization.

20573998380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 20573998380 in words is "twenty billion, five hundred seventy-three million, nine hundred ninety-eight thousand, three hundred eighty".