19770740 has 24 divisors (see below), whose sum is σ = 45293472. Its totient is φ = 7189280.

The previous prime is 19770719. The next prime is 19770743. The reversal of 19770740 is 4707791.

It is a self number, because there is not a number n which added to its sum of digits gives 19770740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19770743) 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, 44714 + ... + 45153.

It is an arithmetic number, because the mean of its divisors is an integer number (1887228).

Almost surely, 2^19770740 is an apocalyptic number.

19770740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19770740 is an abundant number, since it is smaller than the sum of its proper divisors (25522732).

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

19770740 is a wasteful number, since it uses less digits than its factorization.

19770740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89887 (or 89885 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 35.

The square root of 19770740 is about 4446.4300286859. The cubic root of 19770740 is about 270.4005941947.

The spelling of 19770740 in words is "nineteen million, seven hundred seventy thousand, seven hundred forty".