20431233213402 has 64 divisors (see below), whose sum is σ = 46031308259328. Its totient is φ = 5989468056000.

The previous prime is 20431233213401. The next prime is 20431233213403.

It is a happy number.

20431233213402 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (20431233213401) and next prime (20431233213403).

It is a self number, because there is not a number n which added to its sum of digits gives 20431233213402.

It is not an unprimeable number, because it can be changed into a prime (20431233213401) 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, 4108423 + ... + 7598789.

It is an arithmetic number, because the mean of its divisors is an integer number (719239191552).

Almost surely, 2^{20431233213402} is an apocalyptic number.

20431233213402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20431233213402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23015654129664).

20431233213402 is an abundant number, since it is smaller than the sum of its proper divisors (25600075045926).

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

20431233213402 is a wasteful number, since it uses less digits than its factorization.

20431233213402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3493275.

The product of its (nonzero) digits is 20736, while the sum is 30.

It can be divided in two parts, 2043123 and 3213402, that added together give a palindrome (5256525).

The spelling of 20431233213402 in words is "twenty trillion, four hundred thirty-one billion, two hundred thirty-three million, two hundred thirteen thousand, four hundred two".