20195951019 has 16 divisors (see below), whose sum is σ = 27066883200. Its totient is φ = 13394626560.

The previous prime is 20195950979. The next prime is 20195951047. The reversal of 20195951019 is 91015959102.

It is not a de Polignac number, because 20195951019 - 2¹² = 20195946923 is a prime.

It is a super-2 number, since 2×20195951019² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20195951059) 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, 609132 + ... + 641430.

It is an arithmetic number, because the mean of its divisors is an integer number (1691680200).

Almost surely, 2^20195951019 is an apocalyptic number.

20195951019 is a deficient number, since it is larger than the sum of its proper divisors (6870932181).

20195951019 is a wasteful number, since it uses less digits than its factorization.

20195951019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33370.

The product of its (nonzero) digits is 36450, while the sum is 42.

The spelling of 20195951019 in words is "twenty billion, one hundred ninety-five million, nine hundred fifty-one thousand, nineteen".