20731206 has 16 divisors (see below), whose sum is σ = 41830704. Its totient is φ = 6849024.

The previous prime is 20731189. The next prime is 20731231. The reversal of 20731206 is 60213702.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14611 + ... + 15966.

It is an arithmetic number, because the mean of its divisors is an integer number (2614419).

Almost surely, 2^20731206 is an apocalyptic number.

20731206 is an abundant number, since it is smaller than the sum of its proper divisors (21099498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20731206 is a wasteful number, since it uses less digits than its factorization.

20731206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30695.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 20731206 is about 4553.1534127459. The cubic root of 20731206 is about 274.7102446671.

Adding to 20731206 its reverse (60213702), we get a palindrome (80944908).

It can be divided in two parts, 207 and 31206, that added together give a palindrome (31413).

The spelling of 20731206 in words is "twenty million, seven hundred thirty-one thousand, two hundred six".