20671652 has 6 divisors (see below), whose sum is σ = 36175398. Its totient is φ = 10335824.

The previous prime is 20671649. The next prime is 20671661. The reversal of 20671652 is 25617602.

It can be written as a sum of positive squares in only one way, i.e., 20647936 + 23716 = 4544^2 + 154^2 .

It is a super-3 number, since 3×20671652³ (a number of 23 digits) contains 333 as substring.

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, 2583953 + ... + 2583960.

It is an arithmetic number, because the mean of its divisors is an integer number (6029233).

Almost surely, 2^20671652 is an apocalyptic number.

It is an amenable number.

20671652 is a deficient number, since it is larger than the sum of its proper divisors (15503746).

20671652 is a wasteful number, since it uses less digits than its factorization.

20671652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5167917 (or 5167915 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20671652 is about 4546.6088461622. The cubic root of 20671652 is about 274.4469413697.

The spelling of 20671652 in words is "twenty million, six hundred seventy-one thousand, six hundred fifty-two".