20517772 has 24 divisors (see below), whose sum is σ = 39310992. Its totient is φ = 9292800.

The previous prime is 20517767. The next prime is 20517773. The reversal of 20517772 is 27771502.

It is not an unprimeable number, because it can be changed into a prime (20517773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14872 + ... + 16192.

It is an arithmetic number, because the mean of its divisors is an integer number (1637958).

Almost surely, 2^20517772 is an apocalyptic number.

20517772 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20517772 is a deficient number, since it is larger than the sum of its proper divisors (18793220).

20517772 is a wasteful number, since it uses less digits than its factorization.

20517772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689 (or 1687 counting only the distinct ones).

The product of its (nonzero) digits is 6860, while the sum is 31.

The square root of 20517772 is about 4529.6547329791. The cubic root of 20517772 is about 273.7642492392.

The spelling of 20517772 in words is "twenty million, five hundred seventeen thousand, seven hundred seventy-two".