20501513 has 8 divisors (see below), whose sum is σ = 21988800. Its totient is φ = 19055088.

The previous prime is 20501501. The next prime is 20501519. The reversal of 20501513 is 31510502.

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 20501513 - 2⁶ = 20501449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20501491 and 20501500.

It is not an unprimeable number, because it can be changed into a prime (20501519) 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, 9173 + ... + 11186.

It is an arithmetic number, because the mean of its divisors is an integer number (2748600).

Almost surely, 2^20501513 is an apocalyptic number.

It is an amenable number.

20501513 is a deficient number, since it is larger than the sum of its proper divisors (1487287).

20501513 is a wasteful number, since it uses less digits than its factorization.

20501513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20431.

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

The square root of 20501513 is about 4527.8596488849. The cubic root of 20501513 is about 273.6919166748.

The spelling of 20501513 in words is "twenty million, five hundred one thousand, five hundred thirteen".