20658191025 has 24 divisors (see below), whose sum is σ = 34160893920. Its totient is φ = 11015760640.

The previous prime is 20658191023. The next prime is 20658191063. The reversal of 20658191025 is 52019185602.

It is not a de Polignac number, because 20658191025 - 2¹ = 20658191023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20658191023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 471241 + ... + 513209.

It is an arithmetic number, because the mean of its divisors is an integer number (1423370580).

Almost surely, 2^20658191025 is an apocalyptic number.

20658191025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20658191025 is a deficient number, since it is larger than the sum of its proper divisors (13502702895).

20658191025 is a wasteful number, since it uses less digits than its factorization.

20658191025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48545 (or 48540 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 39.

It can be divided in two parts, 206581 and 91025, that added together give a triangular number (297606 = T₇₇₁).

The spelling of 20658191025 in words is "twenty billion, six hundred fifty-eight million, one hundred ninety-one thousand, twenty-five".