19923490 has 32 divisors (see below), whose sum is σ = 38257920. Its totient is φ = 7444224.

The previous prime is 19923487. The next prime is 19923511. The reversal of 19923490 is 9432991.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27351 + ... + 28069.

It is an arithmetic number, because the mean of its divisors is an integer number (1195560).

Almost surely, 2^19923490 is an apocalyptic number.

19923490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19923490 is a deficient number, since it is larger than the sum of its proper divisors (18334430).

19923490 is a wasteful number, since it uses less digits than its factorization.

19923490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 19923490 is about 4463.5736803597. The cubic root of 19923490 is about 271.0951858547.

The spelling of 19923490 in words is "nineteen million, nine hundred twenty-three thousand, four hundred ninety".