20655131 has 16 divisors (see below), whose sum is σ = 24267264. Its totient is φ = 17216064.

The previous prime is 20655101. The next prime is 20655143. The reversal of 20655131 is 13155602.

It is a cyclic number.

It is not a de Polignac number, because 20655131 - 2¹⁰ = 20654107 is a prime.

It is a super-2 number, since 2×20655131² = 853268873254322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20655097 and 20655106.

It is not an unprimeable number, because it can be changed into a prime (20655101) 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 15 ways as a sum of consecutive naturals, for example, 42170 + ... + 42656.

It is an arithmetic number, because the mean of its divisors is an integer number (1516704).

Almost surely, 2^20655131 is an apocalyptic number.

20655131 is a deficient number, since it is larger than the sum of its proper divisors (3612133).

20655131 is an equidigital number, since it uses as much as digits as its factorization.

20655131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 20655131 is about 4544.7916343877. The cubic root of 20655131 is about 274.3738082634.

The spelling of 20655131 in words is "twenty million, six hundred fifty-five thousand, one hundred thirty-one".