20311451225 has 24 divisors (see below), whose sum is σ = 28302896832. Its totient is φ = 14347080000.

The previous prime is 20311451203. The next prime is 20311451261. The reversal of 20311451225 is 52215411302.

It is a de Polignac number, because none of the positive numbers 2^k-20311451225 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20311451194 and 20311451203.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1351151 + ... + 1366100.

It is an arithmetic number, because the mean of its divisors is an integer number (1179287368).

Almost surely, 2^20311451225 is an apocalyptic number.

20311451225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20311451225 is a deficient number, since it is larger than the sum of its proper divisors (7991445607).

20311451225 is a wasteful number, since it uses less digits than its factorization.

20311451225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2717297 (or 2717292 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 20311451225 its reverse (52215411302), we get a palindrome (72526862527).

The spelling of 20311451225 in words is "twenty billion, three hundred eleven million, four hundred fifty-one thousand, two hundred twenty-five".