20920516 has 6 divisors (see below), whose sum is σ = 36610910. Its totient is φ = 10460256.

The previous prime is 20920511. The next prime is 20920519. The reversal of 20920516 is 61502902.

It can be written as a sum of positive squares in only one way, i.e., 18455616 + 2464900 = 4296^2 + 1570^2 .

It is not an unprimeable number, because it can be changed into a prime (20920511) 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 as a sum of consecutive naturals, namely, 2615061 + ... + 2615068.

Almost surely, 2^20920516 is an apocalyptic number.

It is an amenable number.

20920516 is a deficient number, since it is larger than the sum of its proper divisors (15690394).

20920516 is a wasteful number, since it uses less digits than its factorization.

20920516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5230133 (or 5230131 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 20920516 is about 4573.8950578254. The cubic root of 20920516 is about 275.5438976694.

The spelling of 20920516 in words is "twenty million, nine hundred twenty thousand, five hundred sixteen".