20475620 has 36 divisors (see below), whose sum is σ = 47268732. Its totient is φ = 7444800.

The previous prime is 20475613. The next prime is 20475641. The reversal of 20475620 is 2657402.

It can be written as a sum of positive squares in 2 ways, for example, as 12545764 + 7929856 = 3542^2 + 2816^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20475620.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1811 + ... + 6650.

Almost surely, 2^20475620 is an apocalyptic number.

20475620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20475620 is an abundant number, since it is smaller than the sum of its proper divisors (26793112).

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

20475620 is a wasteful number, since it uses less digits than its factorization.

20475620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8492 (or 8479 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 20475620 is about 4524.9994475138. Note that the first 3 decimals coincide. The cubic root of 20475620 is about 273.5766456645.

It can be divided in two parts, 2047 and 5620, that added together give a palindrome (7667).

The spelling of 20475620 in words is "twenty million, four hundred seventy-five thousand, six hundred twenty".