20947310 has 32 divisors (see below), whose sum is σ = 40672800. Its totient is φ = 7741440.

The previous prime is 20947271. The next prime is 20947327. The reversal of 20947310 is 1374902.

It is a super-2 number, since 2×20947310² = 877579592472200, which contains 22 as substring.

It is a Curzon number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 20947310.

It is a congruent number.

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, 6446 + ... + 9134.

It is an arithmetic number, because the mean of its divisors is an integer number (1271025).

Almost surely, 2^20947310 is an apocalyptic number.

20947310 is a deficient number, since it is larger than the sum of its proper divisors (19725490).

20947310 is a wasteful number, since it uses less digits than its factorization.

20947310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2756.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20947310 is about 4576.8231340090. The cubic root of 20947310 is about 275.6614819829.

The spelling of 20947310 in words is "twenty million, nine hundred forty-seven thousand, three hundred ten".