20698390 has 32 divisors (see below), whose sum is σ = 40144896. Its totient is φ = 7661280.

The previous prime is 20698387. The next prime is 20698397. The reversal of 20698390 is 9389602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20698397) 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, 5679 + ... + 8581.

It is an arithmetic number, because the mean of its divisors is an integer number (1254528).

Almost surely, 2^20698390 is an apocalyptic number.

20698390 is a deficient number, since it is larger than the sum of its proper divisors (19446506).

20698390 is a wasteful number, since it uses less digits than its factorization.

20698390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2964.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 20698390 is about 4549.5483292301. The cubic root of 20698390 is about 274.5652193011.

It can be divided in two parts, 206 and 98390, that added together give a square (98596 = 314²).

The spelling of 20698390 in words is "twenty million, six hundred ninety-eight thousand, three hundred ninety".