20401355402 has 16 divisors (see below), whose sum is σ = 31243011552. Its totient is φ = 9987803280.

The previous prime is 20401355363. The next prime is 20401355437. The reversal of 20401355402 is 20455310402.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143948 + ... + 248039.

It is an arithmetic number, because the mean of its divisors is an integer number (1952688222).

Almost surely, 2^20401355402 is an apocalyptic number.

20401355402 is a deficient number, since it is larger than the sum of its proper divisors (10841656150).

20401355402 is a wasteful number, since it uses less digits than its factorization.

20401355402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392533.

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 20401355402 its reverse (20455310402), we get a palindrome (40856665804).

The spelling of 20401355402 in words is "twenty billion, four hundred one million, three hundred fifty-five thousand, four hundred two".