20685435615061 has 16 divisors (see below), whose sum is σ = 23662900445184. Its totient is φ = 17713578834864.

The previous prime is 20685435615023. The next prime is 20685435615137. The reversal of 20685435615061 is 16051653458602.

It is a cyclic number.

It is not a de Polignac number, because 20685435615061 - 2⁹ = 20685435614549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20685436615061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33487770 + ... + 34099876.

It is an arithmetic number, because the mean of its divisors is an integer number (1478931277824).

Almost surely, 2^{20685435615061} is an apocalyptic number.

It is an amenable number.

20685435615061 is a deficient number, since it is larger than the sum of its proper divisors (2977464830123).

20685435615061 is a wasteful number, since it uses less digits than its factorization.

20685435615061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616680.

The product of its (nonzero) digits is 5184000, while the sum is 52.

The spelling of 20685435615061 in words is "twenty trillion, six hundred eighty-five billion, four hundred thirty-five million, six hundred fifteen thousand, sixty-one".