20501315 has 4 divisors (see below), whose sum is σ = 24601584. Its totient is φ = 16401048.

The previous prime is 20501309. The next prime is 20501329. The reversal of 20501315 is 51310502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51310502 = 2 ⋅25655251.

It is a cyclic number.

It is not a de Polignac number, because 20501315 - 2¹⁴ = 20484931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20501293 and 20501302.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2050127 + ... + 2050136.

It is an arithmetic number, because the mean of its divisors is an integer number (6150396).

Almost surely, 2^20501315 is an apocalyptic number.

20501315 is a deficient number, since it is larger than the sum of its proper divisors (4100269).

20501315 is an equidigital number, since it uses as much as digits as its factorization.

20501315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4100268.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 20501315 is about 4527.8377841968. The cubic root of 20501315 is about 273.6910355825.

Adding to 20501315 its reverse (51310502), we get a palindrome (71811817).

The spelling of 20501315 in words is "twenty million, five hundred one thousand, three hundred fifteen".