20621130661436 has 24 divisors (see below), whose sum is σ = 37616329452240. Its totient is φ = 9879036003200.

The previous prime is 20621130661319. The next prime is 20621130661447. The reversal of 20621130661436 is 63416603112602.

It is a junction number, because it is equal to n+sod(n) for n = 20621130661393 and 20621130661402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 678490025 + ... + 678520416.

It is an arithmetic number, because the mean of its divisors is an integer number (1567347060510).

Almost surely, 2^{20621130661436} is an apocalyptic number.

It is an amenable number.

20621130661436 is a deficient number, since it is larger than the sum of its proper divisors (16995198790804).

20621130661436 is a wasteful number, since it uses less digits than its factorization.

20621130661436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357010605 (or 1357010603 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 41.

The spelling of 20621130661436 in words is "twenty trillion, six hundred twenty-one billion, one hundred thirty million, six hundred sixty-one thousand, four hundred thirty-six".