20344005625261 has 16 divisors (see below), whose sum is σ = 21270167944704. Its totient is φ = 19421330432944.

The previous prime is 20344005625259. The next prime is 20344005625277. The reversal of 20344005625261 is 16252650044302.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20344005625261 - 2¹ = 20344005625259 is a prime.

It is a super-2 number, since 2×20344005625261² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20344005625291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52772370 + ... + 53156476.

It is an arithmetic number, because the mean of its divisors is an integer number (1329385496544).

Almost surely, 2^{20344005625261} is an apocalyptic number.

It is an amenable number.

20344005625261 is a deficient number, since it is larger than the sum of its proper divisors (926162319443).

20344005625261 is a wasteful number, since it uses less digits than its factorization.

20344005625261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388640.

The product of its (nonzero) digits is 345600, while the sum is 40.

Adding to 20344005625261 its reverse (16252650044302), we get a palindrome (36596655669563).

The spelling of 20344005625261 in words is "twenty trillion, three hundred forty-four billion, five million, six hundred twenty-five thousand, two hundred sixty-one".