20905662 has 16 divisors (see below), whose sum is σ = 44012160. Its totient is φ = 6601752.

The previous prime is 20905657. The next prime is 20905663. The reversal of 20905662 is 26650902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20905663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91578 + ... + 91805.

It is an arithmetic number, because the mean of its divisors is an integer number (2750760).

Almost surely, 2^20905662 is an apocalyptic number.

20905662 is an abundant number, since it is smaller than the sum of its proper divisors (23106498).

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

20905662 is a wasteful number, since it uses less digits than its factorization.

20905662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183407.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 20905662 is about 4572.2709893444. The cubic root of 20905662 is about 275.4786682693.

The spelling of 20905662 in words is "twenty million, nine hundred five thousand, six hundred sixty-two".