20929356 has 108 divisors (see below), whose sum is σ = 63608272. Its totient is φ = 5683392.

The previous prime is 20929339. The next prime is 20929357. The reversal of 20929356 is 65392902.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20929356.

It is not an unprimeable number, because it can be changed into a prime (20929357) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 133230 + ... + 133386.

Almost surely, 2^20929356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20929356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31804136).

20929356 is an abundant number, since it is smaller than the sum of its proper divisors (42678916).

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

20929356 is a wasteful number, since it uses less digits than its factorization.

20929356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 20929356 is about 4574.8613093732. The cubic root of 20929356 is about 275.5827027201.

The spelling of 20929356 in words is "twenty million, nine hundred twenty-nine thousand, three hundred fifty-six".