20473831 has 8 divisors (see below), whose sum is σ = 24775200. Its totient is φ = 16516608.

The previous prime is 20473823. The next prime is 20473867. The reversal of 20473831 is 13837402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20473831 - 2³ = 20473823 is a prime.

It is a super-2 number, since 2×20473831² = 838355511633122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20473831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20473231) 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, 85906 + ... + 86143.

It is an arithmetic number, because the mean of its divisors is an integer number (3096900).

Almost surely, 2^20473831 is an apocalyptic number.

20473831 is a deficient number, since it is larger than the sum of its proper divisors (4301369).

20473831 is a wasteful number, since it uses less digits than its factorization.

20473831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172073.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20473831 is about 4524.8017636135. The cubic root of 20473831 is about 273.5686777678.

It can be divided in two parts, 20 and 473831, that added together give a triangular number (473851 = T₉₇₃).

The spelling of 20473831 in words is "twenty million, four hundred seventy-three thousand, eight hundred thirty-one".