20565601450020 has 144 divisors (see below), whose sum is σ = 68215094700480. Its totient is φ = 4973757868800.

The previous prime is 20565601450019. The next prime is 20565601450063. The reversal of 20565601450020 is 2005410656502.

20565601450020 is a `hidden beast` number, since 2 + 0 + 5 + 6 + 5 + 601 + 45 + 0 + 0 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11502130 + ... + 13169289.

It is an arithmetic number, because the mean of its divisors is an integer number (473715935420).

Almost surely, 2^{20565601450020} is an apocalyptic number.

20565601450020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20565601450020 is an abundant number, since it is smaller than the sum of its proper divisors (47649493250460).

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

20565601450020 is a wasteful number, since it uses less digits than its factorization.

20565601450020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24671866 (or 24671861 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 20565601450020 in words is "twenty trillion, five hundred sixty-five billion, six hundred one million, four hundred fifty thousand, twenty".