20901397 has 8 divisors (see below), whose sum is σ = 23332320. Its totient is φ = 18558960.

The previous prime is 20901389. The next prime is 20901401. The reversal of 20901397 is 79310902.

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 20901397 - 2³ = 20901389 is a prime.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20901367) 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, 21622 + ... + 22567.

It is an arithmetic number, because the mean of its divisors is an integer number (2916540).

Almost surely, 2^20901397 is an apocalyptic number.

It is an amenable number.

20901397 is a deficient number, since it is larger than the sum of its proper divisors (2430923).

20901397 is a wasteful number, since it uses less digits than its factorization.

20901397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44243.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 20901397 is about 4571.8045671266. The cubic root of 20901397 is about 275.4599333698.

The spelling of 20901397 in words is "twenty million, nine hundred one thousand, three hundred ninety-seven".