20977384 has 8 divisors (see below), whose sum is σ = 39332610. Its totient is φ = 10488688.

The previous prime is 20977381. The next prime is 20977393. The reversal of 20977384 is 48377902.

It can be written as a sum of positive squares in only one way, i.e., 15824484 + 5152900 = 3978^2 + 2270^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×20977384³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20977381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1311079 + ... + 1311094.

Almost surely, 2^20977384 is an apocalyptic number.

It is an amenable number.

20977384 is a deficient number, since it is larger than the sum of its proper divisors (18355226).

20977384 is a wasteful number, since it uses less digits than its factorization.

20977384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2622179 (or 2622175 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 20977384 is about 4580.1074223210. The cubic root of 20977384 is about 275.7933410640.

The spelling of 20977384 in words is "twenty million, nine hundred seventy-seven thousand, three hundred eighty-four".