20531494 has 8 divisors (see below), whose sum is σ = 30930120. Its totient is φ = 10221456.

The previous prime is 20531477. The next prime is 20531501. The reversal of 20531494 is 49413502.

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

It is a congruent number.

It is an unprimeable number.

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, 21564 + ... + 22495.

It is an arithmetic number, because the mean of its divisors is an integer number (3866265).

Almost surely, 2^20531494 is an apocalyptic number.

20531494 is a deficient number, since it is larger than the sum of its proper divisors (10398626).

20531494 is a wasteful number, since it uses less digits than its factorization.

20531494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44294.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20531494 is about 4531.1691647962. The cubic root of 20531494 is about 273.8252655439.

Adding to 20531494 its reverse (49413502), we get a palindrome (69944996).

It can be divided in two parts, 20531 and 494, that added together give a square (21025 = 145²).

The spelling of 20531494 in words is "twenty million, five hundred thirty-one thousand, four hundred ninety-four".