20530916 has 24 divisors (see below), whose sum is σ = 41938176. Its totient is φ = 8611200.

The previous prime is 20530903. The next prime is 20530919. The reversal of 20530916 is 61903502.

20530916 = T₄₀₈ + T₄₀₉ + ... + T₅₇₅.

It is not an unprimeable number, because it can be changed into a prime (20530919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6485 + ... + 9116.

It is an arithmetic number, because the mean of its divisors is an integer number (1747424).

Almost surely, 2^20530916 is an apocalyptic number.

It is an amenable number.

20530916 is an abundant number, since it is smaller than the sum of its proper divisors (21407260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20530916 is a wasteful number, since it uses less digits than its factorization.

20530916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15659 (or 15657 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 20530916 is about 4531.1053838992. The cubic root of 20530916 is about 273.8226959551.

The spelling of 20530916 in words is "twenty million, five hundred thirty thousand, nine hundred sixteen".