20656621345450 has 48 divisors (see below), whose sum is σ = 38854630376640. Its totient is φ = 8169470305920.

The previous prime is 20656621345433. The next prime is 20656621345453. The reversal of 20656621345450 is 5454312665602.

It is a junction number, because it is equal to n+sod(n) for n = 20656621345394 and 20656621345403.

It is not an unprimeable number, because it can be changed into a prime (20656621345453) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 125331997 + ... + 125496703.

It is an arithmetic number, because the mean of its divisors is an integer number (809471466180).

Almost surely, 2^{20656621345450} is an apocalyptic number.

20656621345450 is a deficient number, since it is larger than the sum of its proper divisors (18198009031190).

20656621345450 is a wasteful number, since it uses less digits than its factorization.

20656621345450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192991 (or 192986 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 49.

The spelling of 20656621345450 in words is "twenty trillion, six hundred fifty-six billion, six hundred twenty-one million, three hundred forty-five thousand, four hundred fifty".