20642240154 has 8 divisors (see below), whose sum is σ = 41284480320. Its totient is φ = 6880746716.

The previous prime is 20642240147. The next prime is 20642240207. The reversal of 20642240154 is 45104224602.

It is a sphenic number, since it is the product of 3 distinct primes.

20642240154 is an admirable number.

It is a super-2 number, since 2×20642240154² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1720186674 + ... + 1720186685.

It is an arithmetic number, because the mean of its divisors is an integer number (5160560040).

Almost surely, 2^20642240154 is an apocalyptic number.

20642240154 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20642240154 is a wasteful number, since it uses less digits than its factorization.

20642240154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3440373364.

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 20642240154 its reverse (45104224602), we get a palindrome (65746464756).

The spelling of 20642240154 in words is "twenty billion, six hundred forty-two million, two hundred forty thousand, one hundred fifty-four".