19977420 has 48 divisors (see below), whose sum is σ = 56216160. Its totient is φ = 5300736.

The previous prime is 19977407. The next prime is 19977421. The reversal of 19977420 is 2477991.

It is not an unprimeable number, because it can be changed into a prime (19977421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13266 + ... + 14694.

It is an arithmetic number, because the mean of its divisors is an integer number (1171170).

Almost surely, 2^19977420 is an apocalyptic number.

19977420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19977420 is an abundant number, since it is smaller than the sum of its proper divisors (36238740).

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

19977420 is a wasteful number, since it uses less digits than its factorization.

19977420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1674 (or 1672 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 19977420 is about 4469.6107213045. The cubic root of 19977420 is about 271.3395706090.

The spelling of 19977420 in words is "nineteen million, nine hundred seventy-seven thousand, four hundred twenty".