20345431212646 has 32 divisors (see below), whose sum is σ = 31528727700480. Its totient is φ = 9836402248800.

The previous prime is 20345431212637. The next prime is 20345431212647. The reversal of 20345431212646 is 64621213454302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20345431212647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 541385485 + ... + 541423063.

It is an arithmetic number, because the mean of its divisors is an integer number (985272740640).

Almost surely, 2^{20345431212646} is an apocalyptic number.

20345431212646 is a deficient number, since it is larger than the sum of its proper divisors (11183296487834).

20345431212646 is a wasteful number, since it uses less digits than its factorization.

20345431212646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44620.

The product of its (nonzero) digits is 829440, while the sum is 43.

Adding to 20345431212646 its reverse (64621213454302), we get a palindrome (84966644666948).

The spelling of 20345431212646 in words is "twenty trillion, three hundred forty-five billion, four hundred thirty-one million, two hundred twelve thousand, six hundred forty-six".