20956628 has 24 divisors (see below), whose sum is σ = 45724224. Its totient is φ = 8164800.

The previous prime is 20956627. The next prime is 20956633. The reversal of 20956628 is 82665902.

It is a junction number, because it is equal to n+sod(n) for n = 20956591 and 20956600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20956627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33713 + ... + 34328.

It is an arithmetic number, because the mean of its divisors is an integer number (1905176).

Almost surely, 2^20956628 is an apocalyptic number.

20956628 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20956628 is an abundant number, since it is smaller than the sum of its proper divisors (24767596).

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

20956628 is a wasteful number, since it uses less digits than its factorization.

20956628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68063 (or 68061 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 20956628 is about 4577.8409758313. The cubic root of 20956628 is about 275.7023501249.

The spelling of 20956628 in words is "twenty million, nine hundred fifty-six thousand, six hundred twenty-eight".