20655321 has 8 divisors (see below), whose sum is σ = 27638880. Its totient is φ = 13720992.

The previous prime is 20655301. The next prime is 20655329. The reversal of 20655321 is 12355602.

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

It is not a de Polignac number, because 20655321 - 2¹⁷ = 20524249 is a prime.

It is a super-2 number, since 2×20655321² = 853284571226082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20655291 and 20655300.

It is not an unprimeable number, because it can be changed into a prime (20655329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11316 + ... + 13013.

It is an arithmetic number, because the mean of its divisors is an integer number (3454860).

Almost surely, 2^20655321 is an apocalyptic number.

It is an amenable number.

20655321 is a deficient number, since it is larger than the sum of its proper divisors (6983559).

20655321 is a wasteful number, since it uses less digits than its factorization.

20655321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24615.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 20655321 is about 4544.8125373881. The cubic root of 20655321 is about 274.3746495534.

The spelling of 20655321 in words is "twenty million, six hundred fifty-five thousand, three hundred twenty-one".