20702050020561 has 32 divisors (see below), whose sum is σ = 33987450585088. Its totient is φ = 10914987608640.

The previous prime is 20702050020527. The next prime is 20702050020599. The reversal of 20702050020561 is 16502005020702.

It is not a de Polignac number, because 20702050020561 - 2¹⁵ = 20702049987793 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20702050020761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15954505 + ... + 17203206.

It is an arithmetic number, because the mean of its divisors is an integer number (1062107830784).

Almost surely, 2^{20702050020561} is an apocalyptic number.

20702050020561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20702050020561 is a deficient number, since it is larger than the sum of its proper divisors (13285400564527).

20702050020561 is a wasteful number, since it uses less digits than its factorization.

20702050020561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33160021.

The product of its (nonzero) digits is 8400, while the sum is 30.

The spelling of 20702050020561 in words is "twenty trillion, seven hundred two billion, fifty million, twenty thousand, five hundred sixty-one".