20061644 has 24 divisors (see below), whose sum is σ = 37316160. Its totient is φ = 9410256.

The previous prime is 20061623. The next prime is 20061653. The reversal of 20061644 is 44616002.

It is a happy number.

It is a super-3 number, since 3×20061644³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6899 + ... + 9365.

It is an arithmetic number, because the mean of its divisors is an integer number (1554840).

Almost surely, 2^20061644 is an apocalyptic number.

It is an amenable number.

20061644 is a deficient number, since it is larger than the sum of its proper divisors (17254516).

20061644 is a wasteful number, since it uses less digits than its factorization.

20061644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2597 (or 2595 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20061644 is about 4479.0226612510. The cubic root of 20061644 is about 271.7203548945.

Adding to 20061644 its reverse (44616002), we get a palindrome (64677646).

The spelling of 20061644 in words is "twenty million, sixty-one thousand, six hundred forty-four".