20361021 has 8 divisors (see below), whose sum is σ = 27362304. Its totient is φ = 13466880.

The previous prime is 20360993. The next prime is 20361031. The reversal of 20361021 is 12016302.

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

It is not a de Polignac number, because 20361021 - 2¹⁸ = 20098877 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20361031) 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, 26340 + ... + 27101.

It is an arithmetic number, because the mean of its divisors is an integer number (3420288).

Almost surely, 2^20361021 is an apocalyptic number.

It is an amenable number.

20361021 is a deficient number, since it is larger than the sum of its proper divisors (7001283).

20361021 is a wasteful number, since it uses less digits than its factorization.

20361021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53571.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 20361021 is about 4512.3188052264. The cubic root of 20361021 is about 273.0653012353.

Adding to 20361021 its reverse (12016302), we get a palindrome (32377323).

The spelling of 20361021 in words is "twenty million, three hundred sixty-one thousand, twenty-one".