20690283 has 4 divisors (see below), whose sum is σ = 27587048. Its totient is φ = 13793520.

The previous prime is 20690279. The next prime is 20690303. The reversal of 20690283 is 38209602.

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

It is not a de Polignac number, because 20690283 - 2² = 20690279 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20690283.

It is not an unprimeable number, because it can be changed into a prime (20690213) 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, 3448378 + ... + 3448383.

It is an arithmetic number, because the mean of its divisors is an integer number (6896762).

Almost surely, 2^20690283 is an apocalyptic number.

20690283 is a deficient number, since it is larger than the sum of its proper divisors (6896765).

20690283 is an equidigital number, since it uses as much as digits as its factorization.

20690283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6896764.

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

The square root of 20690283 is about 4548.6572744053. The cubic root of 20690283 is about 274.5293680279.

Adding to 20690283 its reverse (38209602), we get a palindrome (58899885).

The spelling of 20690283 in words is "twenty million, six hundred ninety thousand, two hundred eighty-three".