20445631406 has 4 divisors (see below), whose sum is σ = 30668447112. Its totient is φ = 10222815702.

The previous prime is 20445631387. The next prime is 20445631411. The reversal of 20445631406 is 60413654402.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5111407850 + ... + 5111407853.

It is an arithmetic number, because the mean of its divisors is an integer number (7667111778).

Almost surely, 2^20445631406 is an apocalyptic number.

20445631406 is a deficient number, since it is larger than the sum of its proper divisors (10222815706).

20445631406 is a wasteful number, since it uses less digits than its factorization.

20445631406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10222815705.

The product of its (nonzero) digits is 69120, while the sum is 35.

The spelling of 20445631406 in words is "twenty billion, four hundred forty-five million, six hundred thirty-one thousand, four hundred six".