20361531 has 8 divisors (see below), whose sum is σ = 27170640. Its totient is φ = 13563392.

The previous prime is 20361511. The next prime is 20361533. The reversal of 20361531 is 13516302.

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 20361531 - 2¹⁰ = 20360507 is a prime.

It is a super-2 number, since 2×20361531² = 829183889327922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20361498 and 20361507.

It is not an unprimeable number, because it can be changed into a prime (20361533) 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, 3871 + ... + 7463.

It is an arithmetic number, because the mean of its divisors is an integer number (3396330).

Almost surely, 2^20361531 is an apocalyptic number.

20361531 is a deficient number, since it is larger than the sum of its proper divisors (6809109).

20361531 is a wasteful number, since it uses less digits than its factorization.

20361531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5485.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 20361531 is about 4512.3753168370. The cubic root of 20361531 is about 273.0675811167.

Adding to 20361531 its reverse (13516302), we get a palindrome (33877833).

The spelling of 20361531 in words is "twenty million, three hundred sixty-one thousand, five hundred thirty-one".