20977229 has 16 divisors (see below), whose sum is σ = 26248320. Its totient is φ = 16320960.

The previous prime is 20977217. The next prime is 20977247. The reversal of 20977229 is 92277902.

It is a cyclic number.

It is not a de Polignac number, because 20977229 - 2⁸ = 20976973 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20977192 and 20977201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20977259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3662 + ... + 7440.

It is an arithmetic number, because the mean of its divisors is an integer number (1640520).

Almost surely, 2^20977229 is an apocalyptic number.

It is an amenable number.

20977229 is a deficient number, since it is larger than the sum of its proper divisors (5271091).

20977229 is a wasteful number, since it uses less digits than its factorization.

20977229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3860.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 20977229 is about 4580.0905012892. The cubic root of 20977229 is about 275.7926617916.

The spelling of 20977229 in words is "twenty million, nine hundred seventy-seven thousand, two hundred twenty-nine".