19964690 has 32 divisors (see below), whose sum is σ = 38140416. Its totient is φ = 7508160.

The previous prime is 19964689. The next prime is 19964699. The reversal of 19964690 is 9646991.

It is a super-2 number, since 2×19964690² = 797177693592200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19964699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13319 + ... + 14741.

It is an arithmetic number, because the mean of its divisors is an integer number (1191888).

Almost surely, 2^19964690 is an apocalyptic number.

19964690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19964690 is a deficient number, since it is larger than the sum of its proper divisors (18175726).

19964690 is a wasteful number, since it uses less digits than its factorization.

19964690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 19964690 is about 4468.1864329949. The cubic root of 19964690 is about 271.2819240814.

The spelling of 19964690 in words is "nineteen million, nine hundred sixty-four thousand, six hundred ninety".