20660462646 has 16 divisors (see below), whose sum is σ = 41349657600. Its totient is φ = 6882032168.

The previous prime is 20660462639. The next prime is 20660462653. The reversal of 20660462646 is 64626406602.

It is an interprime number because it is at equal distance from previous prime (20660462639) and next prime (20660462653).

It is a super-2 number, since 2×20660462646² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20660462598 and 20660462607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1187826 + ... + 1205093.

It is an arithmetic number, because the mean of its divisors is an integer number (2584353600).

Almost surely, 2^20660462646 is an apocalyptic number.

20660462646 is an abundant number, since it is smaller than the sum of its proper divisors (20689194954).

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

20660462646 is a wasteful number, since it uses less digits than its factorization.

20660462646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2394363.

The product of its (nonzero) digits is 497664, while the sum is 42.

The spelling of 20660462646 in words is "twenty billion, six hundred sixty million, four hundred sixty-two thousand, six hundred forty-six".