20689342 has 4 divisors (see below), whose sum is σ = 31034016. Its totient is φ = 10344670.

The previous prime is 20689313. The next prime is 20689343. The reversal of 20689342 is 24398602.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 20689298 and 20689307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20689343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5172334 + ... + 5172337.

It is an arithmetic number, because the mean of its divisors is an integer number (7758504).

Almost surely, 2^20689342 is an apocalyptic number.

20689342 is a deficient number, since it is larger than the sum of its proper divisors (10344674).

20689342 is a wasteful number, since it uses less digits than its factorization.

20689342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10344673.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 20689342 is about 4548.5538361110. The cubic root of 20689342 is about 274.5252060733.

The spelling of 20689342 in words is "twenty million, six hundred eighty-nine thousand, three hundred forty-two".