20436630990 has 16 divisors (see below), whose sum is σ = 49047914448. Its totient is φ = 5449768256.

The previous prime is 20436630989. The next prime is 20436631001. The reversal of 20436630990 is 9903663402.

It is a congruent number.

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, 340610487 + ... + 340610546.

It is an arithmetic number, because the mean of its divisors is an integer number (3065494653).

Almost surely, 2^20436630990 is an apocalyptic number.

20436630990 is an abundant number, since it is smaller than the sum of its proper divisors (28611283458).

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

20436630990 is a wasteful number, since it uses less digits than its factorization.

20436630990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681221043.

The product of its (nonzero) digits is 209952, while the sum is 42.

The spelling of 20436630990 in words is "twenty billion, four hundred thirty-six million, six hundred thirty thousand, nine hundred ninety".