20153215 has 8 divisors (see below), whose sum is σ = 24344928. Its totient is φ = 16015200.

The previous prime is 20153213. The next prime is 20153219. The reversal of 20153215 is 51235102.

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

It is not a de Polignac number, because 20153215 - 2¹ = 20153213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20153192 and 20153201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20153213) 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, 12592 + ... + 14101.

It is an arithmetic number, because the mean of its divisors is an integer number (3043116).

Almost surely, 2^20153215 is an apocalyptic number.

20153215 is a deficient number, since it is larger than the sum of its proper divisors (4191713).

20153215 is a wasteful number, since it uses less digits than its factorization.

20153215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26849.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 20153215 is about 4489.2332307422. The cubic root of 20153215 is about 272.1331482988.

Adding to 20153215 its reverse (51235102), we get a palindrome (71388317).

The spelling of 20153215 in words is "twenty million, one hundred fifty-three thousand, two hundred fifteen".