19920340 has 24 divisors (see below), whose sum is σ = 45636192. Its totient is φ = 7243680.

The previous prime is 19920293. The next prime is 19920353. The reversal of 19920340 is 4302991.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19920299 and 19920308.

It is a congruent number.

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, 45054 + ... + 45493.

It is an arithmetic number, because the mean of its divisors is an integer number (1901508).

Almost surely, 2^19920340 is an apocalyptic number.

19920340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19920340 is an abundant number, since it is smaller than the sum of its proper divisors (25715852).

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

19920340 is a wasteful number, since it uses less digits than its factorization.

19920340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90567 (or 90565 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 19920340 is about 4463.2208101325. The cubic root of 19920340 is about 271.0808979490.

The spelling of 19920340 in words is "nineteen million, nine hundred twenty thousand, three hundred forty".