20668736700 has 216 divisors, whose sum is σ = 65515265088. Its totient is φ = 5449973760.

The previous prime is 20668736677. The next prime is 20668736723. The reversal of 20668736700 is 763786602.

20668736700 is a `hidden beast` number, since 206 + 6 + 87 + 367 + 0 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (20668736677) and next prime (20668736723).

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 71 ways as a sum of consecutive naturals, for example, 44640669 + ... + 44641131.

Almost surely, 2^20668736700 is an apocalyptic number.

20668736700 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 20668736700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32757632544).

20668736700 is an abundant number, since it is smaller than the sum of its proper divisors (44846528388).

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

20668736700 is a wasteful number, since it uses less digits than its factorization.

20668736700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933 (or 923 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The spelling of 20668736700 in words is "twenty billion, six hundred sixty-eight million, seven hundred thirty-six thousand, seven hundred".