20959438 has 8 divisors (see below), whose sum is σ = 31613400. Its totient is φ = 10421640.

The previous prime is 20959429. The next prime is 20959459. The reversal of 20959438 is 83495902.

It is a happy number.

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 20959438.

It is a congruent 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, 28588 + ... + 29311.

It is an arithmetic number, because the mean of its divisors is an integer number (3951675).

Almost surely, 2^20959438 is an apocalyptic number.

20959438 is a deficient number, since it is larger than the sum of its proper divisors (10653962).

20959438 is a wasteful number, since it uses less digits than its factorization.

20959438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58082.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 20959438 is about 4578.1478787824. The cubic root of 20959438 is about 275.7146722246.

Subtracting 20959438 from its reverse (83495902), we obtain a square (62536464 = 7908²).

The spelling of 20959438 in words is "twenty million, nine hundred fifty-nine thousand, four hundred thirty-eight".