20690344 has 8 divisors (see below), whose sum is σ = 38794410. Its totient is φ = 10345168.

The previous prime is 20690339. The next prime is 20690347. The reversal of 20690344 is 44309602.

It can be written as a sum of positive squares in only one way, i.e., 11142244 + 9548100 = 3338^2 + 3090^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20690347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1293139 + ... + 1293154.

Almost surely, 2^20690344 is an apocalyptic number.

It is an amenable number.

20690344 is a deficient number, since it is larger than the sum of its proper divisors (18104066).

20690344 is a wasteful number, since it uses less digits than its factorization.

20690344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2586299 (or 2586295 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 20690344 is about 4548.6639796758. The cubic root of 20690344 is about 274.5296378208.

Adding to 20690344 its reverse (44309602), we get a palindrome (64999946).

The spelling of 20690344 in words is "twenty million, six hundred ninety thousand, three hundred forty-four".