20193390 has 144 divisors (see below), whose sum is σ = 64555920. Its totient is φ = 4354560.

The previous prime is 20193347. The next prime is 20193419. The reversal of 20193390 is 9339102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 83670 + ... + 83910.

It is an arithmetic number, because the mean of its divisors is an integer number (448305).

Almost surely, 2^20193390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20193390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32277960).

20193390 is an abundant number, since it is smaller than the sum of its proper divisors (44362530).

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

20193390 is a wasteful number, since it uses less digits than its factorization.

20193390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 20193390 is about 4493.7055978335. The cubic root of 20193390 is about 272.3138587942.

The spelling of 20193390 in words is "twenty million, one hundred ninety-three thousand, three hundred ninety".