20347972 has 24 divisors (see below), whose sum is σ = 37181592. Its totient is φ = 9734400.

The previous prime is 20347909. The next prime is 20347973. The reversal of 20347972 is 27974302.

It can be written as a sum of positive squares in 4 ways, for example, as 1806336 + 18541636 = 1344^2 + 4306^2 .

It is not an unprimeable number, because it can be changed into a prime (20347973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7522 + ... + 9862.

It is an arithmetic number, because the mean of its divisors is an integer number (1549233).

Almost surely, 2^20347972 is an apocalyptic number.

It is an amenable number.

20347972 is a deficient number, since it is larger than the sum of its proper divisors (16833620).

20347972 is a wasteful number, since it uses less digits than its factorization.

20347972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2439 (or 2437 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 20347972 is about 4510.8726428486. The cubic root of 20347972 is about 273.0069546100.

The spelling of 20347972 in words is "twenty million, three hundred forty-seven thousand, nine hundred seventy-two".