20404577357644 has 24 divisors (see below), whose sum is σ = 37809276882048. Its totient is φ = 9601952067840.

The previous prime is 20404577357629. The next prime is 20404577357669. The reversal of 20404577357644 is 44675377540402.

It is a happy number.

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

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, 125374 + ... + 6389434.

It is an arithmetic number, because the mean of its divisors is an integer number (1575386536752).

Almost surely, 2^{20404577357644} is an apocalyptic number.

It is an amenable number.

20404577357644 is a deficient number, since it is larger than the sum of its proper divisors (17404699524404).

20404577357644 is a wasteful number, since it uses less digits than its factorization.

20404577357644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6311985 (or 6311983 counting only the distinct ones).

The product of its (nonzero) digits is 79027200, while the sum is 58.

The spelling of 20404577357644 in words is "twenty trillion, four hundred four billion, five hundred seventy-seven million, three hundred fifty-seven thousand, six hundred forty-four".