20998839810 has 192 divisors, whose sum is σ = 55781913600. Its totient is φ = 5055807744.

The previous prime is 20998839761. The next prime is 20998839817. The reversal of 20998839810 is 1893889902.

It is a super-2 number, since 2×20998839810² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20998839817) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 58492411 + ... + 58492769.

It is an arithmetic number, because the mean of its divisors is an integer number (290530800).

Almost surely, 2^20998839810 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20998839810, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27890956800).

20998839810 is an abundant number, since it is smaller than the sum of its proper divisors (34783073790).

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

20998839810 is a wasteful number, since it uses less digits than its factorization.

20998839810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617 (or 604 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 57.

The spelling of 20998839810 in words is "twenty billion, nine hundred ninety-eight million, eight hundred thirty-nine thousand, eight hundred ten".