20040040646 has 16 divisors (see below), whose sum is σ = 30181759920. Its totient is φ = 9979530720.

The previous prime is 20040040627. The next prime is 20040040663. The reversal of 20040040646 is 64604004002.

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, 518960 + ... + 556236.

It is an arithmetic number, because the mean of its divisors is an integer number (1886359995).

Almost surely, 2^20040040646 is an apocalyptic number.

20040040646 is a deficient number, since it is larger than the sum of its proper divisors (10141719274).

20040040646 is a wasteful number, since it uses less digits than its factorization.

20040040646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38359.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 20040040646 its reverse (64604004002), we get a palindrome (84644044648).

The spelling of 20040040646 in words is "twenty billion, forty million, forty thousand, six hundred forty-six".