20913590 has 16 divisors (see below), whose sum is σ = 38446272. Its totient is φ = 8187264.

The previous prime is 20913569. The next prime is 20913617. The reversal of 20913590 is 9531902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21779 + ... + 22718.

It is an arithmetic number, because the mean of its divisors is an integer number (2402892).

Almost surely, 2^20913590 is an apocalyptic number.

20913590 is a deficient number, since it is larger than the sum of its proper divisors (17532682).

20913590 is a wasteful number, since it uses less digits than its factorization.

20913590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44551.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 20913590 is about 4573.1378724023. The cubic root of 20913590 is about 275.5134868886.

The spelling of 20913590 in words is "twenty million, nine hundred thirteen thousand, five hundred ninety".