19996650 has 72 divisors (see below), whose sum is σ = 55222284. Its totient is φ = 5184000.

The previous prime is 19996649. The next prime is 19996651. The reversal of 19996650 is 5669991.

It is an interprime number because it is at equal distance from previous prime (19996649) and next prime (19996651).

It can be written as a sum of positive squares in 6 ways, for example, as 4575321 + 15421329 = 2139^2 + 3927^2 .

It is a super-2 number, since 2×19996650² = 799732022445000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 19996596 and 19996605.

It is not an unprimeable number, because it can be changed into a prime (19996651) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16050 + ... + 17250.

Almost surely, 2^19996650 is an apocalyptic number.

19996650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19996650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27611142).

19996650 is an abundant number, since it is smaller than the sum of its proper divisors (35225634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19996650 is a wasteful number, since it uses less digits than its factorization.

19996650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256 (or 1248 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 19996650 is about 4471.7613979281. The cubic root of 19996650 is about 271.4266053149.

It can be divided in two parts, 1999 and 6650, that added together give a square (8649 = 93²).

The spelling of 19996650 in words is "nineteen million, nine hundred ninety-six thousand, six hundred fifty".