19969950 has 288 divisors, whose sum is σ = 71245440. Its totient is φ = 3628800.

The previous prime is 19969913. The next prime is 19969979. The reversal of 19969950 is 5996991.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19969950.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1051041 + ... + 1051059.

It is an arithmetic number, because the mean of its divisors is an integer number (247380).

Almost surely, 2^19969950 is an apocalyptic number.

19969950 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 19969950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35622720).

19969950 is an abundant number, since it is smaller than the sum of its proper divisors (51275490).

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

19969950 is a wasteful number, since it uses less digits than its factorization.

19969950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 196830, while the sum is 48.

The square root of 19969950 is about 4468.7749999301. The cubic root of 19969950 is about 271.3057464335.

It can be divided in two parts, 19 and 969950, that added together give a palindrome (969969).

The spelling of 19969950 in words is "nineteen million, nine hundred sixty-nine thousand, nine hundred fifty".