20293530 has 32 divisors (see below), whose sum is σ = 50277888. Its totient is φ = 5236800.

The previous prime is 20293523. The next prime is 20293531. The reversal of 20293530 is 3539202.

20293530 = T₃₈₂ + T₃₈₃ + ... + T₅₆₁.

It is a self number, because there is not a number n which added to its sum of digits gives 20293530.

It is not an unprimeable number, because it can be changed into a prime (20293531) 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, 9981 + ... + 11840.

It is an arithmetic number, because the mean of its divisors is an integer number (1571184).

Almost surely, 2^20293530 is an apocalyptic number.

20293530 is an abundant number, since it is smaller than the sum of its proper divisors (29984358).

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

20293530 is a wasteful number, since it uses less digits than its factorization.

20293530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21862.

The product of its (nonzero) digits is 1620, while the sum is 24.

The square root of 20293530 is about 4504.8340701961. The cubic root of 20293530 is about 272.7632559593.

The spelling of 20293530 in words is "twenty million, two hundred ninety-three thousand, five hundred thirty".