20947460 has 12 divisors (see below), whose sum is σ = 43989708. Its totient is φ = 8378976.

The previous prime is 20947429. The next prime is 20947469. The reversal of 20947460 is 6474902.

It can be written as a sum of positive squares in 2 ways, for example, as 3625216 + 17322244 = 1904^2 + 4162^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20947469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 523667 + ... + 523706.

It is an arithmetic number, because the mean of its divisors is an integer number (3665809).

Almost surely, 2^20947460 is an apocalyptic number.

20947460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20947460 is an abundant number, since it is smaller than the sum of its proper divisors (23042248).

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

20947460 is a wasteful number, since it uses less digits than its factorization.

20947460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047382 (or 1047380 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20947460 is about 4576.8395208921. The cubic root of 20947460 is about 275.6621399691.

The spelling of 20947460 in words is "twenty million, nine hundred forty-seven thousand, four hundred sixty".