20361921 has 8 divisors (see below), whose sum is σ = 27174624. Its totient is φ = 13561920.

The previous prime is 20361917. The next prime is 20361941. The reversal of 20361921 is 12916302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20361921 - 2² = 20361917 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20361891 and 20361900.

It is not an unprimeable number, because it can be changed into a prime (20361941) 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, 1590 + ... + 6576.

It is an arithmetic number, because the mean of its divisors is an integer number (3396828).

Almost surely, 2^20361921 is an apocalyptic number.

It is an amenable number.

20361921 is a deficient number, since it is larger than the sum of its proper divisors (6812703).

20361921 is a wasteful number, since it uses less digits than its factorization.

20361921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6351.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 20361921 is about 4512.4185311205. The cubic root of 20361921 is about 273.0693245298.

The spelling of 20361921 in words is "twenty million, three hundred sixty-one thousand, nine hundred twenty-one".