20964757425 has 24 divisors (see below), whose sum is σ = 36700659936. Its totient is φ = 10523485440.

The previous prime is 20964757423. The next prime is 20964757441. The reversal of 20964757425 is 52475746902.

It is not a de Polignac number, because 20964757425 - 2¹ = 20964757423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (20964757423) 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, 8220199 + ... + 8222748.

It is an arithmetic number, because the mean of its divisors is an integer number (1529194164).

Almost surely, 2^20964757425 is an apocalyptic number.

20964757425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20964757425 is a deficient number, since it is larger than the sum of its proper divisors (15735902511).

20964757425 is a wasteful number, since it uses less digits than its factorization.

20964757425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16442977 (or 16442972 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 51.

The spelling of 20964757425 in words is "twenty billion, nine hundred sixty-four million, seven hundred fifty-seven thousand, four hundred twenty-five".