20721652160406 has 64 divisors (see below), whose sum is σ = 44176470114816. Its totient is φ = 6457167936000.

The previous prime is 20721652160353. The next prime is 20721652160431. The reversal of 20721652160406 is 60406125612702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154892661 + ... + 155026383.

It is an arithmetic number, because the mean of its divisors is an integer number (690257345544).

Almost surely, 2^{20721652160406} is an apocalyptic number.

20721652160406 is an abundant number, since it is smaller than the sum of its proper divisors (23454817954410).

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

20721652160406 is a wasteful number, since it uses less digits than its factorization.

20721652160406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143957.

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 20721652160406 in words is "twenty trillion, seven hundred twenty-one billion, six hundred fifty-two million, one hundred sixty thousand, four hundred six".