20111133402 has 24 divisors (see below), whose sum is σ = 44751802836. Its totient is φ = 6522529536.

The previous prime is 20111133401. The next prime is 20111133431. The reversal of 20111133402 is 20433111102.

20111133402 is a `hidden beast` number, since 20 + 111 + 133 + 402 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19249065081 + 862068321 = 138741^2 + 29361^2 .

It is a super-3 number, since 3×20111133402³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20111133401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15097783 + ... + 15099114.

Almost surely, 2^20111133402 is an apocalyptic number.

20111133402 is an abundant number, since it is smaller than the sum of its proper divisors (24640669434).

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

20111133402 is a wasteful number, since it uses less digits than its factorization.

20111133402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30196942 (or 30196939 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20111133402 its reverse (20433111102), we get a palindrome (40544244504).

The spelling of 20111133402 in words is "twenty billion, one hundred eleven million, one hundred thirty-three thousand, four hundred two".