220520764 has 12 divisors (see below), whose sum is σ = 406222600. Its totient is φ = 104457168.

The previous prime is 220520761. The next prime is 220520767. The reversal of 220520764 is 467025022.

It is an interprime number because it is at equal distance from previous prime (220520761) and next prime (220520767).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220520761) 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 3 ways as a sum of consecutive naturals, for example, 1450719 + ... + 1450870.

Almost surely, 2^220520764 is an apocalyptic number.

It is an amenable number.

220520764 is a deficient number, since it is larger than the sum of its proper divisors (185701836).

220520764 is a wasteful number, since it uses less digits than its factorization.

220520764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2901612 (or 2901610 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 220520764 is about 14849.9415487065. The cubic root of 220520764 is about 604.1570246536.

Adding to 220520764 its reverse (467025022), we get a palindrome (687545786).

The spelling of 220520764 in words is "two hundred twenty million, five hundred twenty thousand, seven hundred sixty-four".