20399085770 has 16 divisors (see below), whose sum is σ = 41963833728. Its totient is φ = 6993972240.

The previous prime is 20399085739. The next prime is 20399085781. The reversal of 20399085770 is 7758099302.

It is a happy number.

It is a super-2 number, since 2×20399085770² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145707686 + ... + 145707825.

It is an arithmetic number, because the mean of its divisors is an integer number (2622739608).

Almost surely, 2^20399085770 is an apocalyptic number.

20399085770 is an abundant number, since it is smaller than the sum of its proper divisors (21564747958).

20399085770 is a wasteful number, since it uses less digits than its factorization.

20399085770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291415525.

The product of its (nonzero) digits is 952560, while the sum is 50.

It can be divided in two parts, 2039 and 9085770, that added together give a palindrome (9087809).

The spelling of 20399085770 in words is "twenty billion, three hundred ninety-nine million, eighty-five thousand, seven hundred seventy".