19900650 has 96 divisors (see below), whose sum is σ = 61567488. Its totient is φ = 4132800.

The previous prime is 19900633. The next prime is 19900651. The reversal of 19900650 is 5600991.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (19900651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10689 + ... + 12411.

It is an arithmetic number, because the mean of its divisors is an integer number (641328).

Almost surely, 2^19900650 is an apocalyptic number.

19900650 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 19900650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30783744).

19900650 is an abundant number, since it is smaller than the sum of its proper divisors (41666838).

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

19900650 is a wasteful number, since it uses less digits than its factorization.

19900650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1756 (or 1751 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 19900650 is about 4461.0144586181. The cubic root of 19900650 is about 270.9915530471.

The spelling of 19900650 in words is "nineteen million, nine hundred thousand, six hundred fifty".