20647771975620 has 72 divisors (see below), whose sum is σ = 62632208358720. Its totient is φ = 5506016846400.

The previous prime is 20647771975583. The next prime is 20647771975657. The reversal of 20647771975620 is 2657917774602.

20647771975620 is a `hidden beast` number, since 2 + 0 + 6 + 477 + 7 + 1 + 97 + 56 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (20647771975583) and next prime (20647771975657).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19123195 + ... + 20174045.

It is an arithmetic number, because the mean of its divisors is an integer number (869891782760).

Almost surely, 2^{20647771975620} is an apocalyptic number.

20647771975620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20647771975620 is an abundant number, since it is smaller than the sum of its proper divisors (41984436383100).

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

20647771975620 is a wasteful number, since it uses less digits than its factorization.

20647771975620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160025 (or 1160020 counting only the distinct ones).

The product of its (nonzero) digits is 62233920, while the sum is 63.

The spelling of 20647771975620 in words is "twenty trillion, six hundred forty-seven billion, seven hundred seventy-one million, nine hundred seventy-five thousand, six hundred twenty".