20645522400 has 72 divisors (see below), whose sum is σ = 67201183224. Its totient is φ = 5505472000.

The previous prime is 20645522393. The next prime is 20645522411. The reversal of 20645522400 is 422554602.

It is a happy number.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4298751 + ... + 4303550.

It is an arithmetic number, because the mean of its divisors is an integer number (933349767).

Almost surely, 2^20645522400 is an apocalyptic number.

20645522400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20645522400 is an abundant number, since it is smaller than the sum of its proper divisors (46555660824).

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

20645522400 is a wasteful number, since it uses less digits than its factorization.

20645522400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8602324 (or 8602311 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The spelling of 20645522400 in words is "twenty billion, six hundred forty-five million, five hundred twenty-two thousand, four hundred".