20155390 has 32 divisors (see below), whose sum is σ = 39093120. Its totient is φ = 7457184.

The previous prime is 20155367. The next prime is 20155411. The reversal of 20155390 is 9355102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6937 + ... + 9403.

It is an arithmetic number, because the mean of its divisors is an integer number (1221660).

Almost surely, 2^20155390 is an apocalyptic number.

20155390 is a deficient number, since it is larger than the sum of its proper divisors (18937730).

20155390 is a wasteful number, since it uses less digits than its factorization.

20155390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2536.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 20155390 is about 4489.4754704754. The cubic root of 20155390 is about 272.1429377758.

The spelling of 20155390 in words is "twenty million, one hundred fifty-five thousand, three hundred ninety".