20401490 has 8 divisors (see below), whose sum is σ = 36722700. Its totient is φ = 8160592.

The previous prime is 20401489. The next prime is 20401499. The reversal of 20401490 is 9410402.

It can be written as a sum of positive squares in 2 ways, for example, as 19775809 + 625681 = 4447^2 + 791^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20401499) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1020065 + ... + 1020084.

Almost surely, 2^20401490 is an apocalyptic number.

20401490 is a deficient number, since it is larger than the sum of its proper divisors (16321210).

20401490 is a wasteful number, since it uses less digits than its factorization.

20401490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040156.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20401490 is about 4516.8008590152. The cubic root of 20401490 is about 273.2460938457.

Adding to 20401490 its reverse (9410402), we get a palindrome (29811892).

The spelling of 20401490 in words is "twenty million, four hundred one thousand, four hundred ninety".