20916502 has 4 divisors (see below), whose sum is σ = 31374756. Its totient is φ = 10458250.

The previous prime is 20916491. The next prime is 20916509. The reversal of 20916502 is 20561902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20561902 = 2 ⋅10280951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20916509) 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, 5229124 + ... + 5229127.

It is an arithmetic number, because the mean of its divisors is an integer number (7843689).

Almost surely, 2^20916502 is an apocalyptic number.

20916502 is a deficient number, since it is larger than the sum of its proper divisors (10458254).

20916502 is a wasteful number, since it uses less digits than its factorization.

20916502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10458253.

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

The square root of 20916502 is about 4573.4562422745. The cubic root of 20916502 is about 275.5262737582.

The spelling of 20916502 in words is "twenty million, nine hundred sixteen thousand, five hundred two".