20909442 has 8 divisors (see below), whose sum is σ = 41818896. Its totient is φ = 6969812.

The previous prime is 20909431. The next prime is 20909453. The reversal of 20909442 is 24490902.

It is an interprime number because it is at equal distance from previous prime (20909431) and next prime (20909453).

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

20909442 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1742448 + ... + 1742459.

It is an arithmetic number, because the mean of its divisors is an integer number (5227362).

Almost surely, 2^20909442 is an apocalyptic number.

20909442 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.

20909442 is a wasteful number, since it uses less digits than its factorization.

20909442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3484912.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 20909442 is about 4572.6843319871. The cubic root of 20909442 is about 275.4952705756.

The spelling of 20909442 in words is "twenty million, nine hundred nine thousand, four hundred forty-two".