20395921 has 8 divisors (see below), whose sum is σ = 25102784. Its totient is φ = 16137360.

The previous prime is 20395919. The next prime is 20395927. The reversal of 20395921 is 12959302.

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 20395921 - 2¹ = 20395919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20395927) 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, 111975 + ... + 112156.

It is an arithmetic number, because the mean of its divisors is an integer number (3137848).

Almost surely, 2^20395921 is an apocalyptic number.

It is an amenable number.

20395921 is a deficient number, since it is larger than the sum of its proper divisors (4706863).

20395921 is a wasteful number, since it uses less digits than its factorization.

20395921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224151.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 20395921 is about 4516.1843407904. The cubic root of 20395921 is about 273.2212288974.

It can be divided in two parts, 20395 and 921, that added together give a square (21316 = 146²).

The spelling of 20395921 in words is "twenty million, three hundred ninety-five thousand, nine hundred twenty-one".