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19999904 = 25624997
BaseRepresentation
bin100110001001…
…0110010100000
31101122002201012
41030102302200
520104444104
61552400052
7331665521
oct114226240
941562635
1019999904
1110320251
126846028
1341b3382
142928848
151b50d6e
hex1312ca0

19999904 has 12 divisors (see below), whose sum is σ = 39374874. Its totient is φ = 9999936.

The previous prime is 19999897. The next prime is 19999909. The reversal of 19999904 is 40999991.

It can be written as a sum of positive squares in only one way, i.e., 13987600 + 6012304 = 3740^2 + 2452^2 .

It is not an unprimeable number, because it can be changed into a prime (19999909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312467 + ... + 312530.

Almost surely, 219999904 is an apocalyptic number.

It is an amenable number.

19999904 is a deficient number, since it is larger than the sum of its proper divisors (19374970).

19999904 is an equidigital number, since it uses as much as digits as its factorization.

19999904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625007 (or 624999 counting only the distinct ones).

The product of its (nonzero) digits is 236196, while the sum is 50.

The square root of 19999904 is about 4472.1252218604. The cubic root of 19999904 is about 271.4413273520.

The spelling of 19999904 in words is "nineteen million, nine hundred ninety-nine thousand, nine hundred four".

Divisors: 1 2 4 8 16 32 624997 1249994 2499988 4999976 9999952 19999904