20251145644 has 6 divisors (see below), whose sum is σ = 35439504884. Its totient is φ = 10125572820.

The previous prime is 20251145623. The next prime is 20251145659. The reversal of 20251145644 is 44654115202.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2531393202 + ... + 2531393209.

Almost surely, 2^20251145644 is an apocalyptic number.

It is an amenable number.

20251145644 is a deficient number, since it is larger than the sum of its proper divisors (15188359240).

20251145644 is a wasteful number, since it uses less digits than its factorization.

20251145644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5062786415 (or 5062786413 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 34.

The spelling of 20251145644 in words is "twenty billion, two hundred fifty-one million, one hundred forty-five thousand, six hundred forty-four".