20942397 has 48 divisors (see below), whose sum is σ = 36691200. Its totient is φ = 11252736.

The previous prime is 20942393. The next prime is 20942417. The reversal of 20942397 is 79324902.

It is not a de Polignac number, because 20942397 - 2² = 20942393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20942393) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 140479 + ... + 140627.

It is an arithmetic number, because the mean of its divisors is an integer number (764400).

Almost surely, 2^20942397 is an apocalyptic number.

It is an amenable number.

20942397 is a deficient number, since it is larger than the sum of its proper divisors (15748803).

20942397 is a wasteful number, since it uses less digits than its factorization.

20942397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 20942397 is about 4576.2863765285. The cubic root of 20942397 is about 275.6399290046.

The spelling of 20942397 in words is "twenty million, nine hundred forty-two thousand, three hundred ninety-seven".