20872730 has 32 divisors (see below), whose sum is σ = 39529728. Its totient is φ = 7920000.

The previous prime is 20872727. The next prime is 20872763. The reversal of 20872730 is 3727802.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20872693 and 20872702.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34430 + ... + 35030.

It is an arithmetic number, because the mean of its divisors is an integer number (1235304).

Almost surely, 2^20872730 is an apocalyptic number.

20872730 is a deficient number, since it is larger than the sum of its proper divisors (18656998).

20872730 is a wasteful number, since it uses less digits than its factorization.

20872730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 20872730 is about 4568.6682961231. The cubic root of 20872730 is about 275.3339414274. Note that the first 3 decimals are identical.

The spelling of 20872730 in words is "twenty million, eight hundred seventy-two thousand, seven hundred thirty".