20165719898 has 16 divisors (see below), whose sum is σ = 30906122400. Its totient is φ = 9865699536.

The previous prime is 20165719841. The next prime is 20165719919. The reversal of 20165719898 is 89891756102.

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, 485036 + ... + 524967.

It is an arithmetic number, because the mean of its divisors is an integer number (1931632650).

Almost surely, 2^20165719898 is an apocalyptic number.

20165719898 is a deficient number, since it is larger than the sum of its proper divisors (10740402502).

20165719898 is a wasteful number, since it uses less digits than its factorization.

20165719898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010221.

The product of its (nonzero) digits is 2177280, while the sum is 56.

The spelling of 20165719898 in words is "twenty billion, one hundred sixty-five million, seven hundred nineteen thousand, eight hundred ninety-eight".