20401212436 has 96 divisors (see below), whose sum is σ = 41236070400. Its totient is φ = 8745770880.

The previous prime is 20401212431. The next prime is 20401212449. The reversal of 20401212436 is 63421210402.

It is a happy number.

It is a super-3 number, since 3×20401212436³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20401212436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401212431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10856545 + ... + 10858423.

It is an arithmetic number, because the mean of its divisors is an integer number (429542400).

Almost surely, 2^20401212436 is an apocalyptic number.

It is an amenable number.

20401212436 is an abundant number, since it is smaller than the sum of its proper divisors (20834857964).

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

20401212436 is a wasteful number, since it uses less digits than its factorization.

20401212436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117 (or 2115 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 20401212436 its reverse (63421210402), we get a palindrome (83822422838).

The spelling of 20401212436 in words is "twenty billion, four hundred one million, two hundred twelve thousand, four hundred thirty-six".