20511441 has 16 divisors (see below), whose sum is σ = 30576000. Its totient is φ = 13589424.

The previous prime is 20511437. The next prime is 20511457. The reversal of 20511441 is 14411502.

It is not a de Polignac number, because 20511441 - 2² = 20511437 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20511041) 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, 2235 + ... + 6783.

It is an arithmetic number, because the mean of its divisors is an integer number (1911000).

Almost surely, 2^20511441 is an apocalyptic number.

It is an amenable number.

20511441 is a deficient number, since it is larger than the sum of its proper divisors (10064559).

20511441 is a wasteful number, since it uses less digits than its factorization.

20511441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4725 (or 4719 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 20511441 is about 4528.9558399260. The cubic root of 20511441 is about 273.7360886156.

Adding to 20511441 its reverse (14411502), we get a palindrome (34922943).

The spelling of 20511441 in words is "twenty million, five hundred eleven thousand, four hundred forty-one".