20642928 has 20 divisors (see below), whose sum is σ = 53327688. Its totient is φ = 6880960.

The previous prime is 20642903. The next prime is 20642971. The reversal of 20642928 is 82924602.

It is a super-2 number, since 2×20642928² = 852260952826368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214983 + ... + 215078.

Almost surely, 2^20642928 is an apocalyptic number.

It is an amenable number.

20642928 is an abundant number, since it is smaller than the sum of its proper divisors (32684760).

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

20642928 is a wasteful number, since it uses less digits than its factorization.

20642928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430072 (or 430066 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 20642928 is about 4543.4489102443. The cubic root of 20642928 is about 274.3197644980.

It can be divided in two parts, 206 and 42928, that added together give a palindrome (43134).

The spelling of 20642928 in words is "twenty million, six hundred forty-two thousand, nine hundred twenty-eight".