20772218 has 8 divisors (see below), whose sum is σ = 31196340. Its totient is φ = 10373440.

The previous prime is 20772209. The next prime is 20772233. The reversal of 20772218 is 81227702.

It can be written as a sum of positive squares in 2 ways, for example, as 16265089 + 4507129 = 4033^2 + 2123^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4133 + ... + 7656.

Almost surely, 2^20772218 is an apocalyptic number.

20772218 is a deficient number, since it is larger than the sum of its proper divisors (10424122).

20772218 is a wasteful number, since it uses less digits than its factorization.

20772218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12672.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 20772218 is about 4557.6548794309. The cubic root of 20772218 is about 274.8912760288.

The spelling of 20772218 in words is "twenty million, seven hundred seventy-two thousand, two hundred eighteen".