20929638 has 8 divisors (see below), whose sum is σ = 41859288. Its totient is φ = 6976544.

The previous prime is 20929637. The next prime is 20929651. The reversal of 20929638 is 83692902.

It is a sphenic number, since it is the product of 3 distinct primes.

20929638 is an admirable number.

It is a super-2 number, since 2×20929638² = 876099493622088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20929596 and 20929605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20929633) 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, 1744131 + ... + 1744142.

It is an arithmetic number, because the mean of its divisors is an integer number (5232411).

Almost surely, 2^20929638 is an apocalyptic number.

20929638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20929638 is a wasteful number, since it uses less digits than its factorization.

20929638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3488278.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 20929638 is about 4574.8921298759. The cubic root of 20929638 is about 275.5839404389.

The spelling of 20929638 in words is "twenty million, nine hundred twenty-nine thousand, six hundred thirty-eight".