20117572 has 6 divisors (see below), whose sum is σ = 35205758. Its totient is φ = 10058784.

The previous prime is 20117567. The next prime is 20117611. The reversal of 20117572 is 27571102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13645636 + 6471936 = 3694^2 + 2544^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2514693 + ... + 2514700.

Almost surely, 2^20117572 is an apocalyptic number.

It is an amenable number.

20117572 is a deficient number, since it is larger than the sum of its proper divisors (15088186).

20117572 is a wasteful number, since it uses less digits than its factorization.

20117572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5029397 (or 5029395 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 20117572 is about 4485.2616423125. The cubic root of 20117572 is about 271.9726219560.

Adding to 20117572 its reverse (27571102), we get a palindrome (47688674).

The spelling of 20117572 in words is "twenty million, one hundred seventeen thousand, five hundred seventy-two".