206757748678420 has 48 divisors (see below), whose sum is σ = 436008068407296. Its totient is φ = 82357066944000.

The previous prime is 206757748678307. The next prime is 206757748678421. The reversal of 206757748678420 is 24876847757602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206757748678421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140547285 + ... + 142010755.

It is an arithmetic number, because the mean of its divisors is an integer number (9083501425152).

Almost surely, 2^{206757748678420} is an apocalyptic number.

206757748678420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206757748678420 is an abundant number, since it is smaller than the sum of its proper divisors (229250319728876).

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

206757748678420 is a wasteful number, since it uses less digits than its factorization.

206757748678420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493032 (or 1493030 counting only the distinct ones).

The product of its (nonzero) digits is 1770209280, while the sum is 73.

The spelling of 206757748678420 in words is "two hundred six trillion, seven hundred fifty-seven billion, seven hundred forty-eight million, six hundred seventy-eight thousand, four hundred twenty".