20464531 has 2 divisors, whose sum is σ = 20464532. Its totient is φ = 20464530.

The previous prime is 20464529. The next prime is 20464537. The reversal of 20464531 is 13546402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20464531 - 2¹ = 20464529 is a prime.

It is a super-2 number, since 2×20464531² = 837594058099922, which contains 22 as substring.

Together with 20464529, it forms a pair of twin primes.

It is equal to p_1298140 and since 20464531 and 1298140 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 20464496 and 20464505.

It is not a weakly prime, because it can be changed into another prime (20464537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10232265 + 10232266.

It is an arithmetic number, because the mean of its divisors is an integer number (10232266).

Almost surely, 2^20464531 is an apocalyptic number.

20464531 is a deficient number, since it is larger than the sum of its proper divisors (1).

20464531 is an equidigital number, since it uses as much as digits as its factorization.

20464531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20464531 is about 4523.7739775546. The cubic root of 20464531 is about 273.5272496960.

The spelling of 20464531 in words is "twenty million, four hundred sixty-four thousand, five hundred thirty-one".