20871364 has 6 divisors (see below), whose sum is σ = 36524894. Its totient is φ = 10435680.

The previous prime is 20871353. The next prime is 20871379. The reversal of 20871364 is 46317802.

It can be written as a sum of positive squares in only one way, i.e., 20520900 + 350464 = 4530^2 + 592^2 .

It is a super-2 number, since 2×20871364² = 871227670440992, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2608917 + ... + 2608924.

Almost surely, 2^20871364 is an apocalyptic number.

It is an amenable number.

20871364 is a deficient number, since it is larger than the sum of its proper divisors (15653530).

20871364 is a wasteful number, since it uses less digits than its factorization.

20871364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5217845 (or 5217843 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20871364 is about 4568.5187971595. The cubic root of 20871364 is about 275.3279349560.

The spelling of 20871364 in words is "twenty million, eight hundred seventy-one thousand, three hundred sixty-four".