20642416549 has 8 divisors (see below), whose sum is σ = 21865740480. Its totient is φ = 19420099776.

The previous prime is 20642416537. The next prime is 20642416607. The reversal of 20642416549 is 94561424602.

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

It is a cyclic number.

It is not a de Polignac number, because 20642416549 - 2¹¹ = 20642414501 is a prime.

It is a super-2 number, since 2×20642416549² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20642416519) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 209379 + ... + 291760.

It is an arithmetic number, because the mean of its divisors is an integer number (2733217560).

Almost surely, 2^20642416549 is an apocalyptic number.

It is an amenable number.

20642416549 is a deficient number, since it is larger than the sum of its proper divisors (1223323931).

20642416549 is a wasteful number, since it uses less digits than its factorization.

20642416549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503579.

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 20642416549 in words is "twenty billion, six hundred forty-two million, four hundred sixteen thousand, five hundred forty-nine".