20650531 has 16 divisors (see below), whose sum is σ = 23431680. Its totient is φ = 18035680.

The previous prime is 20650519. The next prime is 20650541. The reversal of 20650531 is 13505602.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20650531 - 2⁵ = 20650499 is a prime.

It is a super-2 number, since 2×20650531² = 852888861163922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20650501) 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, 30165 + ... + 30841.

It is an arithmetic number, because the mean of its divisors is an integer number (1464480).

Almost surely, 2^20650531 is an apocalyptic number.

20650531 is a deficient number, since it is larger than the sum of its proper divisors (2781149).

20650531 is a wasteful number, since it uses less digits than its factorization.

20650531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 20650531 is about 4544.2855324022. The cubic root of 20650531 is about 274.3534386158.

Subtracting from 20650531 its reverse (13505602), we obtain a square (7144929 = 2673²).

The spelling of 20650531 in words is "twenty million, six hundred fifty thousand, five hundred thirty-one".