20415121207 has 16 divisors (see below), whose sum is σ = 23177613312. Its totient is φ = 17848798560.

The previous prime is 20415121201. The next prime is 20415121217. The reversal of 20415121207 is 70212151402.

It is a cyclic number.

It is not a de Polignac number, because 20415121207 - 2⁷ = 20415121079 is a prime.

It is a super-2 number, since 2×20415121207² (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 (20415121201) 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, 519973 + ... + 557854.

It is an arithmetic number, because the mean of its divisors is an integer number (1448600832).

Almost surely, 2^20415121207 is an apocalyptic number.

20415121207 is a deficient number, since it is larger than the sum of its proper divisors (2762492105).

20415121207 is a wasteful number, since it uses less digits than its factorization.

20415121207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077918.

The product of its (nonzero) digits is 1120, while the sum is 25.

Adding to 20415121207 its reverse (70212151402), we get a palindrome (90627272609).

The spelling of 20415121207 in words is "twenty billion, four hundred fifteen million, one hundred twenty-one thousand, two hundred seven".