20981552020 has 192 divisors, whose sum is σ = 53322022656. Its totient is φ = 6833848320.

The previous prime is 20981551951. The next prime is 20981552021. The reversal of 20981552020 is 2025518902.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20981552021) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14702547 + ... + 14703973.

It is an arithmetic number, because the mean of its divisors is an integer number (277718868).

Almost surely, 2^20981552020 is an apocalyptic number.

20981552020 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 20981552020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26661011328).

20981552020 is an abundant number, since it is smaller than the sum of its proper divisors (32340470636).

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

20981552020 is a wasteful number, since it uses less digits than its factorization.

20981552020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610 (or 1608 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 20981552020 in words is "twenty billion, nine hundred eighty-one million, five hundred fifty-two thousand, twenty".