20746864 has 10 divisors (see below), whose sum is σ = 40197080. Its totient is φ = 10373424.

The previous prime is 20746853. The next prime is 20746883. The reversal of 20746864 is 46864702.

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, 648324 + ... + 648355.

It is an arithmetic number, because the mean of its divisors is an integer number (4019708).

Almost surely, 2^20746864 is an apocalyptic number.

It is an amenable number.

20746864 is a deficient number, since it is larger than the sum of its proper divisors (19450216).

20746864 is a wasteful number, since it uses less digits than its factorization.

20746864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296687 (or 1296681 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 20746864 is about 4554.8725558461. The cubic root of 20746864 is about 274.7793889084.

The spelling of 20746864 in words is "twenty million, seven hundred forty-six thousand, eight hundred sixty-four".