20646415377542 has 8 divisors (see below), whose sum is σ = 31177472886000. Its totient is φ = 10253924415544.

The previous prime is 20646415377541. The next prime is 20646415377559. The reversal of 20646415377542 is 24577351464602.

It is a sphenic number, since it is the product of 3 distinct primes.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34641636242 + ... + 34641636837.

It is an arithmetic number, because the mean of its divisors is an integer number (3897184110750).

Almost surely, 2^{20646415377542} is an apocalyptic number.

20646415377542 is a deficient number, since it is larger than the sum of its proper divisors (10531057508458).

20646415377542 is a wasteful number, since it uses less digits than its factorization.

20646415377542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69283273230.

The product of its (nonzero) digits is 33868800, while the sum is 56.

The spelling of 20646415377542 in words is "twenty trillion, six hundred forty-six billion, four hundred fifteen million, three hundred seventy-seven thousand, five hundred forty-two".