20667898944 has 252 divisors, whose sum is σ = 75178694448. Its totient is φ = 5368204800.

The previous prime is 20667898943. The next prime is 20667899023. The reversal of 20667898944 is 44989876602.

It is a tau number, because it is divible by the number of its divisors (252).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (20667898943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 277179 + ... + 343749.

Almost surely, 2^20667898944 is an apocalyptic number.

20667898944 is a gapful number since it is divisible by the number (24) 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 20667898944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37589347224).

20667898944 is an abundant number, since it is smaller than the sum of its proper divisors (54510795504).

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

20667898944 is a wasteful number, since it uses less digits than its factorization.

20667898944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66614 (or 66594 counting only the distinct ones).

The product of its (nonzero) digits is 41803776, while the sum is 63.

The spelling of 20667898944 in words is "twenty billion, six hundred sixty-seven million, eight hundred ninety-eight thousand, nine hundred forty-four".