20654650 has 12 divisors (see below), whose sum is σ = 38417742. Its totient is φ = 8261840.

The previous prime is 20654617. The next prime is 20654659. The reversal of 20654650 is 5645602.

It can be written as a sum of positive squares in 3 ways, for example, as 17665209 + 2989441 = 4203^2 + 1729^2 .

It is a super-2 number, since 2×20654650² = 853229133245000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20654659) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 206497 + ... + 206596.

Almost surely, 2^20654650 is an apocalyptic number.

20654650 is a deficient number, since it is larger than the sum of its proper divisors (17763092).

20654650 is a wasteful number, since it uses less digits than its factorization.

20654650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413105 (or 413100 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 20654650 is about 4544.7387163620. The cubic root of 20654650 is about 274.3716784484.

The spelling of 20654650 in words is "twenty million, six hundred fifty-four thousand, six hundred fifty".