20661723578952 has 48 divisors (see below), whose sum is σ = 56907289530000. Its totient is φ = 6770508290016.

The previous prime is 20661723578869. The next prime is 20661723578959. The reversal of 20661723578952 is 25987532716602.

20661723578952 is a `hidden beast` number, since 2 + 0 + 6 + 6 + 1 + 7 + 2 + 3 + 578 + 9 + 52 = 666.

It is a super-3 number, since 3×20661723578952³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20661723578952.

It is not an unprimeable number, because it can be changed into a prime (20661723578959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2431931202 + ... + 2431939697.

It is an arithmetic number, because the mean of its divisors is an integer number (1185568531875).

Almost surely, 2^{20661723578952} is an apocalyptic number.

It is an amenable number.

20661723578952 is an abundant number, since it is smaller than the sum of its proper divisors (36245565951048).

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

20661723578952 is a wasteful number, since it uses less digits than its factorization.

20661723578952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4863870970 (or 4863870963 counting only the distinct ones).

The product of its (nonzero) digits is 76204800, while the sum is 63.

The spelling of 20661723578952 in words is "twenty trillion, six hundred sixty-one billion, seven hundred twenty-three million, five hundred seventy-eight thousand, nine hundred fifty-two".