20351606256646 has 64 divisors (see below), whose sum is σ = 36335513692800. Its totient is φ = 8368583040000.

The previous prime is 20351606256607. The next prime is 20351606256679. The reversal of 20351606256646 is 64665260615302.

It is a super-2 number, since 2×20351606256646² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20351606256593 and 20351606256602.

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, 7460116 + ... + 9816136.

It is an arithmetic number, because the mean of its divisors is an integer number (567742401450).

Almost surely, 2^{20351606256646} is an apocalyptic number.

20351606256646 is a deficient number, since it is larger than the sum of its proper divisors (15983907436154).

20351606256646 is a wasteful number, since it uses less digits than its factorization.

20351606256646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356321.

The product of its (nonzero) digits is 9331200, while the sum is 52.

The spelling of 20351606256646 in words is "twenty trillion, three hundred fifty-one billion, six hundred six million, two hundred fifty-six thousand, six hundred forty-six".