20020646 has 4 divisors (see below), whose sum is σ = 30030972. Its totient is φ = 10010322.

The previous prime is 20020633. The next prime is 20020673. The reversal of 20020646 is 64602002.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005160 + ... + 5005163.

It is an arithmetic number, because the mean of its divisors is an integer number (7507743).

Almost surely, 2^20020646 is an apocalyptic number.

20020646 is a deficient number, since it is larger than the sum of its proper divisors (10010326).

20020646 is a wasteful number, since it uses less digits than its factorization.

20020646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10010325.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20020646 is about 4474.4436525673. The cubic root of 20020646 is about 271.5351326481.

Adding to 20020646 its reverse (64602002), we get a palindrome (84622648).

The spelling of 20020646 in words is "twenty million, twenty thousand, six hundred forty-six".