20901628 has 12 divisors (see below), whose sum is σ = 39903192. Its totient is φ = 9500720.

The previous prime is 20901607. The next prime is 20901631. The reversal of 20901628 is 82610902.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20901596 and 20901605.

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, 237475 + ... + 237562.

It is an arithmetic number, because the mean of its divisors is an integer number (3325266).

Almost surely, 2^20901628 is an apocalyptic number.

It is an amenable number.

20901628 is a deficient number, since it is larger than the sum of its proper divisors (19001564).

20901628 is a wasteful number, since it uses less digits than its factorization.

20901628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475052 (or 475050 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 20901628 is about 4571.8298306039. The cubic root of 20901628 is about 275.4609481506.

The spelling of 20901628 in words is "twenty million, nine hundred one thousand, six hundred twenty-eight".