20642124 has 12 divisors (see below), whose sum is σ = 48164984. Its totient is φ = 6880704.

The previous prime is 20642099. The next prime is 20642129. The reversal of 20642124 is 42124602.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 20642124.

It is not an unprimeable number, because it can be changed into a prime (20642129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 860077 + ... + 860100.

Almost surely, 2^20642124 is an apocalyptic number.

It is an amenable number.

20642124 is an abundant number, since it is smaller than the sum of its proper divisors (27522860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20642124 is a wasteful number, since it uses less digits than its factorization.

20642124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720184 (or 1720182 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 20642124 is about 4543.3604303423. The cubic root of 20642124 is about 274.3162030530.

Adding to 20642124 its reverse (42124602), we get a palindrome (62766726).

The spelling of 20642124 in words is "twenty million, six hundred forty-two thousand, one hundred twenty-four".