20643050 has 24 divisors (see below), whose sum is σ = 38625132. Its totient is φ = 8208000.

The previous prime is 20643043. The next prime is 20643061. The reversal of 20643050 is 5034602.

It can be written as a sum of positive squares in 6 ways, for example, as 2486929 + 18156121 = 1577^2 + 4261^2 .

It is a super-2 number, since 2×20643050² = 852271026605000, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7910 + ... + 10190.

Almost surely, 2^20643050 is an apocalyptic number.

20643050 is a deficient number, since it is larger than the sum of its proper divisors (17982082).

20643050 is a wasteful number, since it uses less digits than its factorization.

20643050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2474 (or 2469 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20643050 is about 4543.4623361485. The cubic root of 20643050 is about 274.3203049082.

Adding to 20643050 its reverse (5034602), we get a palindrome (25677652).

The spelling of 20643050 in words is "twenty million, six hundred forty-three thousand, fifty".