20387513 has 8 divisors (see below), whose sum is σ = 21756000. Its totient is φ = 19048608.

The previous prime is 20387503. The next prime is 20387561. The reversal of 20387513 is 31578302.

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 20387513 - 2⁶ = 20387449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20387503) 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, 5963 + ... + 8736.

It is an arithmetic number, because the mean of its divisors is an integer number (2719500).

Almost surely, 2^20387513 is an apocalyptic number.

It is an amenable number.

20387513 is a deficient number, since it is larger than the sum of its proper divisors (1368487).

20387513 is a wasteful number, since it uses less digits than its factorization.

20387513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14791.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20387513 is about 4515.2533705209. The cubic root of 20387513 is about 273.1836795620.

It can be divided in two parts, 2038751 and 3, that multiplied together give a triangular number (6116253 = T₃₄₉₇).

The spelling of 20387513 in words is "twenty million, three hundred eighty-seven thousand, five hundred thirteen".