20988210420 has 144 divisors (see below), whose sum is σ = 65022048000. Its totient is φ = 5478310656.

The previous prime is 20988210413. The next prime is 20988210449. The reversal of 20988210420 is 2401288902.

20988210420 is a `hidden beast` number, since 209 + 8 + 8 + 21 + 0 + 420 = 666.

It is a super-3 number, since 3×20988210420³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 2534046 + ... + 2542314.

It is an arithmetic number, because the mean of its divisors is an integer number (451542000).

Almost surely, 2^20988210420 is an apocalyptic number.

20988210420 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 20988210420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32511024000).

20988210420 is an abundant number, since it is smaller than the sum of its proper divisors (44033837580).

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

20988210420 is a wasteful number, since it uses less digits than its factorization.

20988210420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8582 (or 8577 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The spelling of 20988210420 in words is "twenty billion, nine hundred eighty-eight million, two hundred ten thousand, four hundred twenty".