20423445342515 has 16 divisors (see below), whose sum is σ = 25950067384032. Its totient is φ = 15377488218624.

The previous prime is 20423445342497. The next prime is 20423445342527. The reversal of 20423445342515 is 51524354432402.

It is a cyclic number.

It is not a de Polignac number, because 20423445342515 - 2¹⁴ = 20423445326131 is a prime.

It is a super-3 number, since 3×20423445342515³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian 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, 7006172 + ... + 9483318.

It is an arithmetic number, because the mean of its divisors is an integer number (1621879211502).

Almost surely, 2^{20423445342515} is an apocalyptic number.

20423445342515 is a deficient number, since it is larger than the sum of its proper divisors (5526622041517).

20423445342515 is a wasteful number, since it uses less digits than its factorization.

20423445342515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2574166.

The product of its (nonzero) digits is 2304000, while the sum is 44.

Adding to 20423445342515 its reverse (51524354432402), we get a palindrome (71947799774917).

The spelling of 20423445342515 in words is "twenty trillion, four hundred twenty-three billion, four hundred forty-five million, three hundred forty-two thousand, five hundred fifteen".