20123220025 has 24 divisors (see below), whose sum is σ = 26554829400. Its totient is φ = 15074626560.

The previous prime is 20123220001. The next prime is 20123220037. The reversal of 20123220025 is 52002232102.

It can be written as a sum of positive squares in 12 ways, for example, as 267028281 + 19856191744 = 16341^2 + 140912^2 .

It is not a de Polignac number, because 20123220025 - 2⁵ = 20123219993 is a prime.

It is a super-2 number, since 2×20123220025² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20123219984 and 20123220011.

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, 36450 + ... + 203899.

It is an arithmetic number, because the mean of its divisors is an integer number (1106451225).

Almost surely, 2^20123220025 is an apocalyptic number.

20123220025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20123220025 is a deficient number, since it is larger than the sum of its proper divisors (6431609375).

20123220025 is a wasteful number, since it uses less digits than its factorization.

20123220025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240573 (or 240568 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

Adding to 20123220025 its reverse (52002232102), we get a palindrome (72125452127).

The spelling of 20123220025 in words is "twenty billion, one hundred twenty-three million, two hundred twenty thousand, twenty-five".