220646642 has 4 divisors (see below), whose sum is σ = 330969966. Its totient is φ = 110323320.

The previous prime is 220646633. The next prime is 220646669. The reversal of 220646642 is 246646022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 217002361 + 3644281 = 14731^2 + 1909^2 .

It is a junction number, because it is equal to n+sod(n) for n = 220646599 and 220646608.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55161659 + ... + 55161662.

Almost surely, 2^220646642 is an apocalyptic number.

220646642 is a deficient number, since it is larger than the sum of its proper divisors (110323324).

220646642 is a wasteful number, since it uses less digits than its factorization.

220646642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110323323.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 220646642 is about 14854.1792772270. The cubic root of 220646642 is about 604.2719580667.

The spelling of 220646642 in words is "two hundred twenty million, six hundred forty-six thousand, six hundred forty-two".