20492517 has 32 divisors (see below), whose sum is σ = 29859840. Its totient is φ = 12467840.

The previous prime is 20492513. The next prime is 20492543. The reversal of 20492517 is 71529402.

It is not a de Polignac number, because 20492517 - 2² = 20492513 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20492513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 230209 + ... + 230297.

It is an arithmetic number, because the mean of its divisors is an integer number (933120).

Almost surely, 2^20492517 is an apocalyptic number.

It is an amenable number.

20492517 is a deficient number, since it is larger than the sum of its proper divisors (9367323).

20492517 is a wasteful number, since it uses less digits than its factorization.

20492517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 20492517 is about 4526.8661345350. The cubic root of 20492517 is about 273.6518790982.

The spelling of 20492517 in words is "twenty million, four hundred ninety-two thousand, five hundred seventeen".