20555550501 has 16 divisors (see below), whose sum is σ = 30104240640. Its totient is φ = 12417997680.

The previous prime is 20555550479. The next prime is 20555550553. The reversal of 20555550501 is 10505555502.

It is not a de Polignac number, because 20555550501 - 2¹⁰ = 20555549477 is a prime.

It is a super-2 number, since 2×20555550501² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555550571) 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 15 ways as a sum of consecutive naturals, for example, 7838335 + ... + 7840956.

It is an arithmetic number, because the mean of its divisors is an integer number (1881515040).

Almost surely, 2^20555550501 is an apocalyptic number.

It is an amenable number.

20555550501 is a deficient number, since it is larger than the sum of its proper divisors (9548690139).

20555550501 is a wasteful number, since it uses less digits than its factorization.

20555550501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15679336.

The product of its (nonzero) digits is 31250, while the sum is 33.

The spelling of 20555550501 in words is "twenty billion, five hundred fifty-five million, five hundred fifty thousand, five hundred one".