20386868 has 6 divisors (see below), whose sum is σ = 35677026. Its totient is φ = 10193432.

The previous prime is 20386853. The next prime is 20386879. The reversal of 20386868 is 86868302.

It can be written as a sum of positive squares in only one way, i.e., 18421264 + 1965604 = 4292^2 + 1402^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2548355 + ... + 2548362.

It is an arithmetic number, because the mean of its divisors is an integer number (5946171).

Almost surely, 2^20386868 is an apocalyptic number.

It is an amenable number.

20386868 is a deficient number, since it is larger than the sum of its proper divisors (15290158).

20386868 is a wasteful number, since it uses less digits than its factorization.

20386868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5096721 (or 5096719 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 20386868 is about 4515.1819453927. The cubic root of 20386868 is about 273.1807986265.

The spelling of 20386868 in words is "twenty million, three hundred eighty-six thousand, eight hundred sixty-eight".