20291601590 has 32 divisors (see below), whose sum is σ = 39585067200. Its totient is φ = 7444554624.

The previous prime is 20291601587. The next prime is 20291601611. The reversal of 20291601590 is 9510619202.

It is a self number, because there is not a number n which added to its sum of digits gives 20291601590.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 476690 + ... + 517509.

It is an arithmetic number, because the mean of its divisors is an integer number (1237033350).

Almost surely, 2^20291601590 is an apocalyptic number.

20291601590 is a deficient number, since it is larger than the sum of its proper divisors (19293465610).

20291601590 is a wasteful number, since it uses less digits than its factorization.

20291601590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994376.

The product of its (nonzero) digits is 9720, while the sum is 35.

The spelling of 20291601590 in words is "twenty billion, two hundred ninety-one million, six hundred one thousand, five hundred ninety".