20690933 has 4 divisors (see below), whose sum is σ = 20709888. Its totient is φ = 20671980.

The previous prime is 20690927. The next prime is 20690939. The reversal of 20690933 is 33909602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (20690927) and next prime (20690939).

It is a cyclic number.

It is not a de Polignac number, because 20690933 - 2¹⁰ = 20689909 is a prime.

It is a super-2 number, since 2×20690933² = 856229416820978, which contains 22 as substring.

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 20690933.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20690939) 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, 7733 + ... + 10058.

It is an arithmetic number, because the mean of its divisors is an integer number (5177472).

Almost surely, 2^20690933 is an apocalyptic number.

It is an amenable number.

20690933 is a deficient number, since it is larger than the sum of its proper divisors (18955).

20690933 is a wasteful number, since it uses less digits than its factorization.

20690933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18954.

The product of its (nonzero) digits is 8748, while the sum is 32.

The square root of 20690933 is about 4548.7287235007. The cubic root of 20690933 is about 274.5322428431.

The spelling of 20690933 in words is "twenty million, six hundred ninety thousand, nine hundred thirty-three".