20770321 has 16 divisors (see below), whose sum is σ = 24530688. Its totient is φ = 17337600.

The previous prime is 20770307. The next prime is 20770327. The reversal of 20770321 is 12307702.

It is a cyclic number.

It is not a de Polignac number, because 20770321 - 2⁵ = 20770289 is a prime.

It is a super-4 number, since 4×20770321⁴ (a number of 30 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20770292 and 20770301.

It is not an unprimeable number, because it can be changed into a prime (20770327) 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 15 ways as a sum of consecutive naturals, for example, 47976 + ... + 48406.

It is an arithmetic number, because the mean of its divisors is an integer number (1533168).

Almost surely, 2^20770321 is an apocalyptic number.

It is an amenable number.

20770321 is a deficient number, since it is larger than the sum of its proper divisors (3760367).

20770321 is a wasteful number, since it uses less digits than its factorization.

20770321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792.

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 20770321 is about 4557.4467632656. The cubic root of 20770321 is about 274.8829077261.

The spelling of 20770321 in words is "twenty million, seven hundred seventy thousand, three hundred twenty-one".