19620890 has 32 divisors (see below), whose sum is σ = 37641024. Its totient is φ = 7338240.

The previous prime is 19620889. The next prime is 19620917. The reversal of 19620890 is 9802691.

19620890 is nontrivially palindromic in base 14.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19620890.

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 15 ways as a sum of consecutive naturals, for example, 35597 + ... + 36143.

It is an arithmetic number, because the mean of its divisors is an integer number (1176282).

Almost surely, 2^19620890 is an apocalyptic number.

19620890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19620890 is a deficient number, since it is larger than the sum of its proper divisors (18020134).

19620890 is a wasteful number, since it uses less digits than its factorization.

19620890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 19620890 is about 4429.5473809409. The cubic root of 19620890 is about 269.7157044150.

The spelling of 19620890 in words is "nineteen million, six hundred twenty thousand, eight hundred ninety".