20197930 has 32 divisors (see below), whose sum is σ = 37866240. Its totient is φ = 7750080.

The previous prime is 20197909. The next prime is 20197937. The reversal of 20197930 is 3979102.

It is a junction number, because it is equal to n+sod(n) for n = 20197892 and 20197901.

It is not an unprimeable number, because it can be changed into a prime (20197937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28885 + ... + 29575.

It is an arithmetic number, because the mean of its divisors is an integer number (1183320).

Almost surely, 2^20197930 is an apocalyptic number.

20197930 is a deficient number, since it is larger than the sum of its proper divisors (17668310).

20197930 is a wasteful number, since it uses less digits than its factorization.

20197930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 20197930 is about 4494.2107204714. The cubic root of 20197930 is about 272.3342650142.

The spelling of 20197930 in words is "twenty million, one hundred ninety-seven thousand, nine hundred thirty".