20631033644 has 24 divisors (see below), whose sum is σ = 40927963440. Its totient is φ = 9020856384.

The previous prime is 20631033641. The next prime is 20631033671. The reversal of 20631033644 is 44633013602.

It is a self number, because there is not a number n which added to its sum of digits gives 20631033644.

It is not an unprimeable number, because it can be changed into a prime (20631033641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10439819 + ... + 10441794.

It is an arithmetic number, because the mean of its divisors is an integer number (1705331810).

Almost surely, 2^20631033644 is an apocalyptic number.

It is an amenable number.

20631033644 is a deficient number, since it is larger than the sum of its proper divisors (20296929796).

20631033644 is a wasteful number, since it uses less digits than its factorization.

20631033644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20881649 (or 20881647 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 32.

The spelling of 20631033644 in words is "twenty billion, six hundred thirty-one million, thirty-three thousand, six hundred forty-four".