19953740 has 24 divisors (see below), whose sum is σ = 43349040. Its totient is φ = 7706048.

The previous prime is 19953701. The next prime is 19953751. The reversal of 19953740 is 4735991.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19953694 and 19953703.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16622 + ... + 17781.

It is an arithmetic number, because the mean of its divisors is an integer number (1806210).

Almost surely, 2^19953740 is an apocalyptic number.

19953740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19953740 is an abundant number, since it is smaller than the sum of its proper divisors (23395300).

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

19953740 is a wasteful number, since it uses less digits than its factorization.

19953740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34441 (or 34439 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 19953740 is about 4466.9609355803. The cubic root of 19953740 is about 271.2323184975.

The spelling of 19953740 in words is "nineteen million, nine hundred fifty-three thousand, seven hundred forty".