20953057608 has 96 divisors (see below), whose sum is σ = 64950724800. Its totient is φ = 5977724544.

The previous prime is 20953057603. The next prime is 20953057613. The reversal of 20953057608 is 80675035902.

It is a happy number.

20953057608 is a `hidden beast` number, since 2 + 0 + 9 + 5 + 30 + 5 + 7 + 608 = 666.

It is an interprime number because it is at equal distance from previous prime (20953057603) and next prime (20953057613).

It is not an unprimeable number, because it can be changed into a prime (20953057603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 313798 + ... + 374666.

It is an arithmetic number, because the mean of its divisors is an integer number (676570050).

Almost surely, 2^20953057608 is an apocalyptic number.

20953057608 is a gapful number since it is divisible by the number (28) 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 20953057608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32475362400).

20953057608 is an abundant number, since it is smaller than the sum of its proper divisors (43997667192).

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

20953057608 is a wasteful number, since it uses less digits than its factorization.

20953057608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61571 (or 61564 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 20953057608 in words is "twenty billion, nine hundred fifty-three million, fifty-seven thousand, six hundred eight".