20209008090 has 32 divisors (see below), whose sum is σ = 48582633600. Its totient is φ = 5380067264.

The previous prime is 20209008049. The next prime is 20209008101. The reversal of 20209008090 is 9080090202.

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

It is a Curzon 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, 544329 + ... + 580268.

It is an arithmetic number, because the mean of its divisors is an integer number (1518207300).

Almost surely, 2^20209008090 is an apocalyptic number.

20209008090 is an abundant number, since it is smaller than the sum of its proper divisors (28373625510).

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

20209008090 is a wasteful number, since it uses less digits than its factorization.

20209008090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125206.

The product of its (nonzero) digits is 2592, while the sum is 30.

Adding to 20209008090 its reverse (9080090202), we get a palindrome (29289098292).

The spelling of 20209008090 in words is "twenty billion, two hundred nine million, eight thousand, ninety".