20989241952 has 192 divisors, whose sum is σ = 64887588864. Its totient is φ = 5816401920.

The previous prime is 20989241921. The next prime is 20989241983. The reversal of 20989241952 is 25914298902.

It is an interprime number because it is at equal distance from previous prime (20989241921) and next prime (20989241983).

It is a junction number, because it is equal to n+sod(n) for n = 20989241895 and 20989241904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3566052 + ... + 3571932.

It is an arithmetic number, because the mean of its divisors is an integer number (337956192).

Almost surely, 2^20989241952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20989241952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32443794432).

20989241952 is an abundant number, since it is smaller than the sum of its proper divisors (43898346912).

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

20989241952 is a wasteful number, since it uses less digits than its factorization.

20989241952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6061 (or 6053 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 51.

The spelling of 20989241952 in words is "twenty billion, nine hundred eighty-nine million, two hundred forty-one thousand, nine hundred fifty-two".