20556028 has 12 divisors (see below), whose sum is σ = 36236592. Its totient is φ = 10202720.

The previous prime is 20556023. The next prime is 20556031. The reversal of 20556028 is 82065502.

It is a junction number, because it is equal to n+sod(n) for n = 20555987 and 20556005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20556023) 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, 18208 + ... + 19303.

It is an arithmetic number, because the mean of its divisors is an integer number (3019716).

Almost surely, 2^20556028 is an apocalyptic number.

It is an amenable number.

20556028 is a deficient number, since it is larger than the sum of its proper divisors (15680564).

20556028 is a wasteful number, since it uses less digits than its factorization.

20556028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37652 (or 37650 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 20556028 is about 4533.8756048220. The cubic root of 20556028 is about 273.9342908126.

The spelling of 20556028 in words is "twenty million, five hundred fifty-six thousand, twenty-eight".