20906208 has 48 divisors (see below), whose sum is σ = 60978960. Its totient is φ = 6968448.

The previous prime is 20906203. The next prime is 20906227. The reversal of 20906208 is 80260902.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20906201) 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, 11235 + ... + 12962.

It is an arithmetic number, because the mean of its divisors is an integer number (1270395).

Almost surely, 2^20906208 is an apocalyptic number.

It is an amenable number.

20906208 is an abundant number, since it is smaller than the sum of its proper divisors (40072752).

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

20906208 is a wasteful number, since it uses less digits than its factorization.

20906208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24216 (or 24202 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20906208 is about 4572.3306967016. The cubic root of 20906208 is about 275.4810665038.

The spelling of 20906208 in words is "twenty million, nine hundred six thousand, two hundred eight".