20901015 has 12 divisors (see below), whose sum is σ = 36228504. Its totient is φ = 11147184.

The previous prime is 20900993. The next prime is 20901029. The reversal of 20901015 is 51010902.

It is not a de Polignac number, because 20901015 - 2¹² = 20896919 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232189 + ... + 232278.

It is an arithmetic number, because the mean of its divisors is an integer number (3019042).

Almost surely, 2^20901015 is an apocalyptic number.

20901015 is a deficient number, since it is larger than the sum of its proper divisors (15327489).

20901015 is a wasteful number, since it uses less digits than its factorization.

20901015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464478 (or 464475 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 20901015 is about 4571.7627891219. The cubic root of 20901015 is about 275.4582552310.

Adding to 20901015 its reverse (51010902), we get a palindrome (71911917).

The spelling of 20901015 in words is "twenty million, nine hundred one thousand, fifteen".