20531151 has 20 divisors (see below), whose sum is σ = 31328352. Its totient is φ = 13393728.

The previous prime is 20531107. The next prime is 20531171. The reversal of 20531151 is 15113502.

It is not a de Polignac number, because 20531151 - 2⁷ = 20531023 is a prime.

It is a super-2 number, since 2×20531151² = 843056322769602, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531171) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1111 + ... + 6503.

Almost surely, 2^20531151 is an apocalyptic number.

20531151 is a deficient number, since it is larger than the sum of its proper divisors (10797201).

20531151 is an equidigital number, since it uses as much as digits as its factorization.

20531151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5452 (or 5443 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 20531151 is about 4531.1313156871. The cubic root of 20531151 is about 273.8237406900.

Adding to 20531151 its reverse (15113502), we get a palindrome (35644653).

The spelling of 20531151 in words is "twenty million, five hundred thirty-one thousand, one hundred fifty-one".