20621230662156 has 12 divisors (see below), whose sum is σ = 48116204878392. Its totient is φ = 6873743554048.

The previous prime is 20621230662139. The next prime is 20621230662181. The reversal of 20621230662156 is 65126603212602.

It is a tau number, because it is divible by the number of its divisors (12).

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, 859217944245 + ... + 859217944268.

It is an arithmetic number, because the mean of its divisors is an integer number (4009683739866).

Almost surely, 2^{20621230662156} is an apocalyptic number.

It is an amenable number.

20621230662156 is an abundant number, since it is smaller than the sum of its proper divisors (27494974216236).

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

20621230662156 is a wasteful number, since it uses less digits than its factorization.

20621230662156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718435888520 (or 1718435888518 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

Adding to 20621230662156 its reverse (65126603212602), we get a palindrome (85747833874758).

The spelling of 20621230662156 in words is "twenty trillion, six hundred twenty-one billion, two hundred thirty million, six hundred sixty-two thousand, one hundred fifty-six".