20091919092 has 48 divisors (see below), whose sum is σ = 54108953472. Its totient is φ = 5683708800.

The previous prime is 20091919091. The next prime is 20091919109. The reversal of 20091919092 is 29091919002.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20091919091) 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, 1175623 + ... + 1192590.

It is an arithmetic number, because the mean of its divisors is an integer number (1127269864).

Almost surely, 2^20091919092 is an apocalyptic number.

It is an amenable number.

20091919092 is an abundant number, since it is smaller than the sum of its proper divisors (34017034380).

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

20091919092 is a wasteful number, since it uses less digits than its factorization.

20091919092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2368328 (or 2368326 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 42.

The spelling of 20091919092 in words is "twenty billion, ninety-one million, nine hundred nineteen thousand, ninety-two".