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19663690 = 2510119469
BaseRepresentation
bin100101100000…
…0101101001010
31101000000111211
41023000231022
520013214230
61541243334
7326065354
oct113005512
941000454
1019663690
1110110692
12670354a
1340c6327
14287c0d4
151ad642a
hex12c0b4a

19663690 has 16 divisors (see below), whose sum is σ = 35746920. Its totient is φ = 7787200.

The previous prime is 19663681. The next prime is 19663691. The reversal of 19663690 is 9636691.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18567481 + 1096209 = 4309^2 + 1047^2 .

It is a super-2 number, since 2×196636902 = 773321408832200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19663691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8725 + ... + 10744.

Almost surely, 219663690 is an apocalyptic number.

19663690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19663690 is a deficient number, since it is larger than the sum of its proper divisors (16083230).

19663690 is a wasteful number, since it uses less digits than its factorization.

19663690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19577.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 19663690 is about 4434.3759425651. The cubic root of 19663690 is about 269.9116766432.

The spelling of 19663690 in words is "nineteen million, six hundred sixty-three thousand, six hundred ninety".

Divisors: 1 2 5 10 101 202 505 1010 19469 38938 97345 194690 1966369 3932738 9831845 19663690