20743172 has 24 divisors (see below), whose sum is σ = 37205952. Its totient is φ = 10116000.

The previous prime is 20743103. The next prime is 20743181. The reversal of 20743172 is 27134702.

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, 36563 + ... + 37125.

It is an arithmetic number, because the mean of its divisors is an integer number (1550248).

Almost surely, 2^20743172 is an apocalyptic number.

It is an amenable number.

20743172 is a deficient number, since it is larger than the sum of its proper divisors (16462780).

20743172 is a wasteful number, since it uses less digits than its factorization.

20743172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 20743172 is about 4554.4672575396. The cubic root of 20743172 is about 274.7630885222.

Adding to 20743172 its reverse (27134702), we get a palindrome (47877874).

The spelling of 20743172 in words is "twenty million, seven hundred forty-three thousand, one hundred seventy-two".