20817442 has 8 divisors (see below), whose sum is σ = 31755600. Its totient is φ = 10232244.

The previous prime is 20817439. The next prime is 20817443. The reversal of 20817442 is 24471802.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20817442.

It is not an unprimeable number, because it can be changed into a prime (20817443) 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, 88092 + ... + 88327.

It is an arithmetic number, because the mean of its divisors is an integer number (3969450).

Almost surely, 2^20817442 is an apocalyptic number.

20817442 is a deficient number, since it is larger than the sum of its proper divisors (10938158).

20817442 is a wasteful number, since it uses less digits than its factorization.

20817442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176480.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 20817442 is about 4562.6135054374. The cubic root of 20817442 is about 275.0906235761.

The spelling of 20817442 in words is "twenty million, eight hundred seventeen thousand, four hundred forty-two".