19699740 has 72 divisors (see below), whose sum is σ = 61610640. Its totient is φ = 5225760.

The previous prime is 19699739. The next prime is 19699763. The reversal of 19699740 is 4799691.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103045 + ... + 103235.

Almost surely, 2^19699740 is an apocalyptic number.

19699740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19699740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30805320).

19699740 is an abundant number, since it is smaller than the sum of its proper divisors (41910900).

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

19699740 is a wasteful number, since it uses less digits than its factorization.

19699740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 19699740 is about 4438.4389147537. The cubic root of 19699740 is about 270.0765215206.

The spelling of 19699740 in words is "nineteen million, six hundred ninety-nine thousand, seven hundred forty".