20401320402 has 48 divisors (see below), whose sum is σ = 44470857600. Its totient is φ = 6759282816.

The previous prime is 20401320397. The next prime is 20401320419. The reversal of 20401320402 is 20402310402.

It is a super-2 number, since 2×20401320402² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4378458 + ... + 4383114.

It is an arithmetic number, because the mean of its divisors is an integer number (926476200).

Almost surely, 2^20401320402 is an apocalyptic number.

20401320402 is an abundant number, since it is smaller than the sum of its proper divisors (24069537198).

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

20401320402 is a wasteful number, since it uses less digits than its factorization.

20401320402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6087 (or 6084 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 20401320402 its reverse (20402310402), we get a palindrome (40803630804).

The spelling of 20401320402 in words is "twenty billion, four hundred one million, three hundred twenty thousand, four hundred two".