20666247254100 has 864 divisors, whose sum is σ = 78389966054400. Its totient is φ = 4448630937600.

The previous prime is 20666247254041. The next prime is 20666247254117. The reversal of 20666247254100 is 145274266602.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 27156697720 + ... + 27156698480.

Almost surely, 2^{20666247254100} is an apocalyptic number.

20666247254100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20666247254100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39194983027200).

20666247254100 is an abundant number, since it is smaller than the sum of its proper divisors (57723718800300).

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

20666247254100 is a wasteful number, since it uses less digits than its factorization.

20666247254100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1853 (or 1843 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 45.

The spelling of 20666247254100 in words is "twenty trillion, six hundred sixty-six billion, two hundred forty-seven million, two hundred fifty-four thousand, one hundred".