20471888 has 10 divisors (see below), whose sum is σ = 39664314. Its totient is φ = 10235936.

The previous prime is 20471881. The next prime is 20471923. The reversal of 20471888 is 88817402.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18421264 + 2050624 = 4292^2 + 1432^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20471881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639731 + ... + 639762.

Almost surely, 2^20471888 is an apocalyptic number.

It is an amenable number.

20471888 is a deficient number, since it is larger than the sum of its proper divisors (19192426).

20471888 is a wasteful number, since it uses less digits than its factorization.

20471888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279501 (or 1279495 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 20471888 is about 4524.5870529806. The cubic root of 20471888 is about 273.5600234560.

The spelling of 20471888 in words is "twenty million, four hundred seventy-one thousand, eight hundred eighty-eight".