20491486 has 16 divisors (see below), whose sum is σ = 31569408. Its totient is φ = 9972000.

The previous prime is 20491469. The next prime is 20491489. The reversal of 20491486 is 68419402.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20491489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11491 + ... + 13153.

It is an arithmetic number, because the mean of its divisors is an integer number (1973088).

Almost surely, 2^20491486 is an apocalyptic number.

20491486 is a deficient number, since it is larger than the sum of its proper divisors (11077922).

20491486 is a wasteful number, since it uses less digits than its factorization.

20491486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1827.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 20491486 is about 4526.7522574137. The cubic root of 20491486 is about 273.6472897836.

The spelling of 20491486 in words is "twenty million, four hundred ninety-one thousand, four hundred eighty-six".