20251240215 has 16 divisors (see below), whose sum is σ = 33810766848. Its totient is φ = 10331067296.

The previous prime is 20251240213. The next prime is 20251240223. The reversal of 20251240215 is 51204215202.

It is a cyclic number.

It is not a de Polignac number, because 20251240215 - 2¹ = 20251240213 is a prime.

It is a super-2 number, since 2×20251240215² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20251240213) 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, 29349279 + ... + 29349968.

It is an arithmetic number, because the mean of its divisors is an integer number (2113172928).

Almost surely, 2^20251240215 is an apocalyptic number.

20251240215 is a deficient number, since it is larger than the sum of its proper divisors (13559526633).

20251240215 is a wasteful number, since it uses less digits than its factorization.

20251240215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58699278.

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 20251240215 its reverse (51204215202), we get a palindrome (71455455417).

The spelling of 20251240215 in words is "twenty billion, two hundred fifty-one million, two hundred forty thousand, two hundred fifteen".