20731072 has 14 divisors (see below), whose sum is σ = 41138348. Its totient is φ = 10365504.

The previous prime is 20731069. The next prime is 20731091. The reversal of 20731072 is 27013702.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161898 + ... + 162025.

Almost surely, 2^20731072 is an apocalyptic number.

It is an amenable number.

20731072 is a deficient number, since it is larger than the sum of its proper divisors (20407276).

20731072 is an equidigital number, since it uses as much as digits as its factorization.

20731072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323935 (or 323925 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 20731072 is about 4553.1386976458. The cubic root of 20731072 is about 274.7096527856.

Adding to 20731072 its reverse (27013702), we get a palindrome (47744774).

The spelling of 20731072 in words is "twenty million, seven hundred thirty-one thousand, seventy-two".