20563672 has 8 divisors (see below), whose sum is σ = 38556900. Its totient is φ = 10281832.

The previous prime is 20563663. The next prime is 20563687. The reversal of 20563672 is 27636502.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×20563672² = 845729212247168, which contains 22 as substring.

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, 1285222 + ... + 1285237.

Almost surely, 2^20563672 is an apocalyptic number.

It is an amenable number.

20563672 is a deficient number, since it is larger than the sum of its proper divisors (17993228).

20563672 is a wasteful number, since it uses less digits than its factorization.

20563672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2570465 (or 2570461 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 20563672 is about 4534.7185138661. The cubic root of 20563672 is about 273.9682418304.

The spelling of 20563672 in words is "twenty million, five hundred sixty-three thousand, six hundred seventy-two".