20913628 has 12 divisors (see below), whose sum is σ = 36659952. Its totient is φ = 10439360.

The previous prime is 20913617. The next prime is 20913643. The reversal of 20913628 is 82631902.

It is a super-2 number, since 2×20913628² = 874759672244768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20913628.

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, 1453 + ... + 6628.

It is an arithmetic number, because the mean of its divisors is an integer number (3054996).

Almost surely, 2^20913628 is an apocalyptic number.

It is an amenable number.

20913628 is a deficient number, since it is larger than the sum of its proper divisors (15746324).

20913628 is a wasteful number, since it uses less digits than its factorization.

20913628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8732 (or 8730 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 20913628 is about 4573.1420270969. The cubic root of 20913628 is about 275.5136537579.

The spelling of 20913628 in words is "twenty million, nine hundred thirteen thousand, six hundred twenty-eight".