20278321152 has 224 divisors, whose sum is σ = 57206814720. Its totient is φ = 6378946560.

The previous prime is 20278321099. The next prime is 20278321153. The reversal of 20278321152 is 25112387202.

It is a super-2 number, since 2×20278321152² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20278321153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32759499 + ... + 32760117.

Almost surely, 2^20278321152 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 20278321152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28603407360).

20278321152 is an abundant number, since it is smaller than the sum of its proper divisors (36928493568).

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

20278321152 is an equidigital number, since it uses as much as digits as its factorization.

20278321152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722 (or 698 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The spelling of 20278321152 in words is "twenty billion, two hundred seventy-eight million, three hundred twenty-one thousand, one hundred fifty-two".