20315572 has 6 divisors (see below), whose sum is σ = 35552258. Its totient is φ = 10157784.

The previous prime is 20315569. The next prime is 20315657. The reversal of 20315572 is 27551302.

It can be written as a sum of positive squares in only one way, i.e., 17089956 + 3225616 = 4134^2 + 1796^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2539443 + ... + 2539450.

Almost surely, 2^20315572 is an apocalyptic number.

It is an amenable number.

20315572 is a deficient number, since it is larger than the sum of its proper divisors (15236686).

20315572 is a wasteful number, since it uses less digits than its factorization.

20315572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5078897 (or 5078895 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 20315572 is about 4507.2798892458. The cubic root of 20315572 is about 272.8619749804.

Adding to 20315572 its reverse (27551302), we get a palindrome (47866874).

The spelling of 20315572 in words is "twenty million, three hundred fifteen thousand, five hundred seventy-two".