20690648 has 32 divisors (see below), whose sum is σ = 42577920. Its totient is φ = 9348000.

The previous prime is 20690647. The next prime is 20690687. The reversal of 20690648 is 84609602.

It is a super-3 number, since 3×20690648³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20690641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16193 + ... + 17423.

It is an arithmetic number, because the mean of its divisors is an integer number (1330560).

Almost surely, 2^20690648 is an apocalyptic number.

It is an amenable number.

20690648 is an abundant number, since it is smaller than the sum of its proper divisors (21887272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20690648 is a wasteful number, since it uses less digits than its factorization.

20690648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1439 (or 1435 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 20690648 is about 4548.6973959585. The cubic root of 20690648 is about 274.5309823546.

The spelling of 20690648 in words is "twenty million, six hundred ninety thousand, six hundred forty-eight".