20690973 has 24 divisors (see below), whose sum is σ = 30591288. Its totient is φ = 13473792.

The previous prime is 20690939. The next prime is 20690977. The reversal of 20690973 is 37909602.

It can be written as a sum of positive squares in 4 ways, for example, as 7601049 + 13089924 = 2757^2 + 3618^2 .

It is not a de Polignac number, because 20690973 - 2¹⁸ = 20428829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20690977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 119515 + ... + 119687.

It is an arithmetic number, because the mean of its divisors is an integer number (1274637).

Almost surely, 2^20690973 is an apocalyptic number.

It is an amenable number.

20690973 is a deficient number, since it is larger than the sum of its proper divisors (9900315).

20690973 is a wasteful number, since it uses less digits than its factorization.

20690973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 20690973 is about 4548.7331203314. The cubic root of 20690973 is about 274.5324197528.

The spelling of 20690973 in words is "twenty million, six hundred ninety thousand, nine hundred seventy-three".