20123251415 has 4 divisors (see below), whose sum is σ = 24147901704. Its totient is φ = 16098601128.

The previous prime is 20123251411. The next prime is 20123251429. The reversal of 20123251415 is 51415232102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20123251415 - 2² = 20123251411 is a prime.

It is a super-2 number, since 2×20123251415² (a number of 21 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 (20123251411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2012325137 + ... + 2012325146.

It is an arithmetic number, because the mean of its divisors is an integer number (6036975426).

Almost surely, 2^20123251415 is an apocalyptic number.

20123251415 is a deficient number, since it is larger than the sum of its proper divisors (4024650289).

20123251415 is an equidigital number, since it uses as much as digits as its factorization.

20123251415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4024650288.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 20123251415 its reverse (51415232102), we get a palindrome (71538483517).

The spelling of 20123251415 in words is "twenty billion, one hundred twenty-three million, two hundred fifty-one thousand, four hundred fifteen".