20690670 has 192 divisors, whose sum is σ = 68304384. Its totient is φ = 3893760.

The previous prime is 20690647. The next prime is 20690687. The reversal of 20690670 is 7609602.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 390364 + ... + 390416.

It is an arithmetic number, because the mean of its divisors is an integer number (355752).

Almost surely, 2^20690670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20690670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34152192).

20690670 is an abundant number, since it is smaller than the sum of its proper divisors (47613714).

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

20690670 is a wasteful number, since it uses less digits than its factorization.

20690670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 20690670 is about 4548.6998142326. The cubic root of 20690670 is about 274.5310796558.

The spelling of 20690670 in words is "twenty million, six hundred ninety thousand, six hundred seventy".