20646415377543 has 16 divisors (see below), whose sum is σ = 27612084307712. Its totient is φ = 13722574824000.

The previous prime is 20646415377541. The next prime is 20646415377559. The reversal of 20646415377543 is 34577351464602.

It is a happy number.

It is not a de Polignac number, because 20646415377543 - 2¹ = 20646415377541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20646415377541) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6583918 + ... + 9200043.

It is an arithmetic number, because the mean of its divisors is an integer number (1725755269232).

Almost surely, 2^{20646415377543} is an apocalyptic number.

20646415377543 is a deficient number, since it is larger than the sum of its proper divisors (6965668930169).

20646415377543 is a wasteful number, since it uses less digits than its factorization.

20646415377543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15785286.

The product of its (nonzero) digits is 50803200, while the sum is 57.

The spelling of 20646415377543 in words is "twenty trillion, six hundred forty-six billion, four hundred fifteen million, three hundred seventy-seven thousand, five hundred forty-three".