20413531 has 8 divisors (see below), whose sum is σ = 21587328. Its totient is φ = 19272000.

The previous prime is 20413511. The next prime is 20413537. The reversal of 20413531 is 13531402.

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 20413531 - 2⁵ = 20413499 is a prime.

It is a super-2 number, since 2×20413531² = 833424495775922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20413499 and 20413508.

It is not an unprimeable number, because it can be changed into a prime (20413537) 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, 6760 + ... + 9301.

It is an arithmetic number, because the mean of its divisors is an integer number (2698416).

Almost surely, 2^20413531 is an apocalyptic number.

20413531 is a deficient number, since it is larger than the sum of its proper divisors (1173797).

20413531 is a wasteful number, since it uses less digits than its factorization.

20413531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16133.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20413531 is about 4518.1335748293. The cubic root of 20413531 is about 273.2998400695.

Adding to 20413531 its reverse (13531402), we get a palindrome (33944933).

The spelling of 20413531 in words is "twenty million, four hundred thirteen thousand, five hundred thirty-one".