20210520125 has 16 divisors (see below), whose sum is σ = 26706421872. Its totient is φ = 15217331200.

The previous prime is 20210520119. The next prime is 20210520137. The reversal of 20210520125 is 52102501202.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 9198536281 + 11011983844 = 95909^2 + 104938^2 .

It is not a de Polignac number, because 20210520125 - 2¹⁴ = 20210503741 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20210520097 and 20210520106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4753292 + ... + 4757541.

It is an arithmetic number, because the mean of its divisors is an integer number (1669151367).

Almost surely, 2^20210520125 is an apocalyptic number.

20210520125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20210520125 is a deficient number, since it is larger than the sum of its proper divisors (6495901747).

20210520125 is an equidigital number, since it uses as much as digits as its factorization.

20210520125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9510865 (or 9510855 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The spelling of 20210520125 in words is "twenty billion, two hundred ten million, five hundred twenty thousand, one hundred twenty-five".