20154417568 has 48 divisors (see below), whose sum is σ = 40358666880. Its totient is φ = 9904838400.

The previous prime is 20154417551. The next prime is 20154417583. The reversal of 20154417568 is 86571445102.

It is a super-4 number, since 4×20154417568⁴ (a number of 42 digits) contains 4444 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3571293 + ... + 3576931.

It is an arithmetic number, because the mean of its divisors is an integer number (840805560).

Almost surely, 2^20154417568 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 20154417568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20179333440).

20154417568 is an abundant number, since it is smaller than the sum of its proper divisors (20204249312).

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

20154417568 is a wasteful number, since it uses less digits than its factorization.

20154417568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7541 (or 7533 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 43.

The spelling of 20154417568 in words is "twenty billion, one hundred fifty-four million, four hundred seventeen thousand, five hundred sixty-eight".