20413653629978 has 12 divisors (see below), whose sum is σ = 35619742558602. Its totient is φ = 8748708698520.

The previous prime is 20413653629881. The next prime is 20413653629983. The reversal of 20413653629978 is 87992635631402.

It can be written as a sum of positive squares in only one way, i.e., 16071335334649 + 4342318295329 = 4008907^2 + 2083823^2 .

It is a super-2 number, since 2×20413653629978² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 104151293933 + ... + 104151294128.

It is a 1-persistent number, because it is pandigital, but 2⋅20413653629978 = 40827307259956 is not.

Almost surely, 2^{20413653629978} is an apocalyptic number.

20413653629978 is a deficient number, since it is larger than the sum of its proper divisors (15206088928624).

20413653629978 is a wasteful number, since it uses less digits than its factorization.

20413653629978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208302588077 (or 208302588070 counting only the distinct ones).

The product of its (nonzero) digits is 117573120, while the sum is 65.

The spelling of 20413653629978 in words is "twenty trillion, four hundred thirteen billion, six hundred fifty-three million, six hundred twenty-nine thousand, nine hundred seventy-eight".