20901029508 has 192 divisors, whose sum is σ = 58586250240. Its totient is φ = 6419865600.

The previous prime is 20901029497. The next prime is 20901029521. The reversal of 20901029508 is 80592010902.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 48270060 + ... + 48270492.

It is an arithmetic number, because the mean of its divisors is an integer number (305136720).

Almost surely, 2^20901029508 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 20901029508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29293125120).

20901029508 is an abundant number, since it is smaller than the sum of its proper divisors (37685220732).

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

20901029508 is a wasteful number, since it uses less digits than its factorization.

20901029508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955 (or 947 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The spelling of 20901029508 in words is "twenty billion, nine hundred one million, twenty-nine thousand, five hundred eight".