19901380 has 24 divisors (see below), whose sum is σ = 43142400. Its totient is φ = 7703520.

The previous prime is 19901377. The next prime is 19901383. The reversal of 19901380 is 8310991.

It is an interprime number because it is at equal distance from previous prime (19901377) and next prime (19901383).

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (19901383) 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, 15430 + ... + 16669.

It is an arithmetic number, because the mean of its divisors is an integer number (1797600).

Almost surely, 2^19901380 is an apocalyptic number.

19901380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19901380 is an abundant number, since it is smaller than the sum of its proper divisors (23241020).

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

19901380 is a wasteful number, since it uses less digits than its factorization.

19901380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32139 (or 32137 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 19901380 is about 4461.0962778223. The cubic root of 19901380 is about 270.9948665304.

The spelling of 19901380 in words is "nineteen million, nine hundred one thousand, three hundred eighty".