20690535 has 8 divisors (see below), whose sum is σ = 33104880. Its totient is φ = 11034944.

The previous prime is 20690531. The next prime is 20690539. The reversal of 20690535 is 53509602.

It is an interprime number because it is at equal distance from previous prime (20690531) and next prime (20690539).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20690535 - 2² = 20690531 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20690531) 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, 689670 + ... + 689699.

It is an arithmetic number, because the mean of its divisors is an integer number (4138110).

Almost surely, 2^20690535 is an apocalyptic number.

20690535 is a deficient number, since it is larger than the sum of its proper divisors (12414345).

20690535 is a wasteful number, since it uses less digits than its factorization.

20690535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379377.

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 20690535 is about 4548.6849748032. The cubic root of 20690535 is about 274.5304825787.

The spelling of 20690535 in words is "twenty million, six hundred ninety thousand, five hundred thirty-five".