20471620 has 24 divisors (see below), whose sum is σ = 46297944. Its totient is φ = 7558656.

The previous prime is 20471603. The next prime is 20471639. The reversal of 20471620 is 2617402.

It can be written as a sum of positive squares in 4 ways, for example, as 329476 + 20142144 = 574^2 + 4488^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20471591 and 20471600.

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, 39109 + ... + 39628.

It is an arithmetic number, because the mean of its divisors is an integer number (1929081).

Almost surely, 2^20471620 is an apocalyptic number.

20471620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20471620 is an abundant number, since it is smaller than the sum of its proper divisors (25826324).

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

20471620 is a wasteful number, since it uses less digits than its factorization.

20471620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78759 (or 78757 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 20471620 is about 4524.5574369213. The cubic root of 20471620 is about 273.5588297148.

It can be divided in two parts, 204 and 71620, that added together give a square (71824 = 268²).

The spelling of 20471620 in words is "twenty million, four hundred seventy-one thousand, six hundred twenty".