20861700 has 36 divisors (see below), whose sum is σ = 60360720. Its totient is φ = 5563040.

The previous prime is 20861699. The next prime is 20861741. The reversal of 20861700 is 716802.

It is a super-3 number, since 3×20861700³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34470 + ... + 35069.

Almost surely, 2^20861700 is an apocalyptic number.

20861700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20861700 is an abundant number, since it is smaller than the sum of its proper divisors (39499020).

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

20861700 is a wasteful number, since it uses less digits than its factorization.

20861700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69556 (or 69549 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 20861700 is about 4567.4610014755. The cubic root of 20861700 is about 275.2854336619.

The spelling of 20861700 in words is "twenty million, eight hundred sixty-one thousand, seven hundred".