20253531 has 8 divisors (see below), whose sum is σ = 27385344. Its totient is φ = 13312040.

The previous prime is 20253521. The next prime is 20253539. The reversal of 20253531 is 13535202.

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 20253531 - 2¹³ = 20245339 is a prime.

It is a super-2 number, since 2×20253531² = 820411035935922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20253498 and 20253507.

It is not an unprimeable number, because it can be changed into a prime (20253539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47331 + ... + 47756.

It is an arithmetic number, because the mean of its divisors is an integer number (3423168).

Almost surely, 2^20253531 is an apocalyptic number.

20253531 is a deficient number, since it is larger than the sum of its proper divisors (7131813).

20253531 is an equidigital number, since it uses as much as digits as its factorization.

20253531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95161.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 20253531 is about 4500.3923162320. The cubic root of 20253531 is about 272.5839306036.

Adding to 20253531 its reverse (13535202), we get a palindrome (33788733).

It can be divided in two parts, 202535 and 31, that added together give a triangular number (202566 = T₆₃₆).

The spelling of 20253531 in words is "twenty million, two hundred fifty-three thousand, five hundred thirty-one".