220400642 has 16 divisors (see below), whose sum is σ = 412178112. Its totient is φ = 85870320.

The previous prime is 220400629. The next prime is 220400701. The reversal of 220400642 is 246004022.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 715433 + ... + 715740.

It is an arithmetic number, because the mean of its divisors is an integer number (25761132).

Almost surely, 2^220400642 is an apocalyptic number.

220400642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

220400642 is a deficient number, since it is larger than the sum of its proper divisors (191777470).

220400642 is a wasteful number, since it uses less digits than its factorization.

220400642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431193.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 220400642 is about 14845.8964700688. The cubic root of 220400642 is about 604.0473059889.

Adding to 220400642 its reverse (246004022), we get a palindrome (466404664).

The spelling of 220400642 in words is "two hundred twenty million, four hundred thousand, six hundred forty-two".