20401563626 has 32 divisors (see below), whose sum is σ = 34088040000. Its totient is φ = 9112536832.

The previous prime is 20401563577. The next prime is 20401563629. The reversal of 20401563626 is 62636510402.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20401563629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117176 + ... + 233523.

It is an arithmetic number, because the mean of its divisors is an integer number (1065251250).

Almost surely, 2^20401563626 is an apocalyptic number.

20401563626 is a deficient number, since it is larger than the sum of its proper divisors (13686476374).

20401563626 is a wasteful number, since it uses less digits than its factorization.

20401563626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350806.

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 20401563626 in words is "twenty billion, four hundred one million, five hundred sixty-three thousand, six hundred twenty-six".