20392564 has 6 divisors (see below), whose sum is σ = 35686994. Its totient is φ = 10196280.

The previous prime is 20392523. The next prime is 20392577. The reversal of 20392564 is 46529302.

It can be written as a sum of positive squares in only one way, i.e., 16744464 + 3648100 = 4092^2 + 1910^2 .

It is a congruent number.

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, 2549067 + ... + 2549074.

Almost surely, 2^20392564 is an apocalyptic number.

It is an amenable number.

20392564 is a deficient number, since it is larger than the sum of its proper divisors (15294430).

20392564 is a wasteful number, since it uses less digits than its factorization.

20392564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5098145 (or 5098143 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 20392564 is about 4515.8126621905. The cubic root of 20392564 is about 273.2062380897.

The spelling of 20392564 in words is "twenty million, three hundred ninety-two thousand, five hundred sixty-four".