20645190251590 has 16 divisors (see below), whose sum is σ = 39117202582320. Its totient is φ = 7823440516320.

The previous prime is 20645190251537. The next prime is 20645190251593. The reversal of 20645190251590 is 9515209154602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645190251593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54329447841 + ... + 54329448220.

It is an arithmetic number, because the mean of its divisors is an integer number (2444825161395).

Almost surely, 2^{20645190251590} is an apocalyptic number.

20645190251590 is a deficient number, since it is larger than the sum of its proper divisors (18472012330730).

20645190251590 is a wasteful number, since it uses less digits than its factorization.

20645190251590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108658896087.

The product of its (nonzero) digits is 972000, while the sum is 49.

The spelling of 20645190251590 in words is "twenty trillion, six hundred forty-five billion, one hundred ninety million, two hundred fifty-one thousand, five hundred ninety".