20908402 has 16 divisors (see below), whose sum is σ = 33312600. Its totient is φ = 9808128.

The previous prime is 20908399. The next prime is 20908409. The reversal of 20908402 is 20480902.

It can be written as a sum of positive squares in 4 ways, for example, as 19722481 + 1185921 = 4441^2 + 1089^2 .

It is a super-2 number, since 2×20908402² = 874322548387208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20908409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12724 + ... + 14272.

Almost surely, 2^20908402 is an apocalyptic number.

20908402 is a deficient number, since it is larger than the sum of its proper divisors (12404198).

20908402 is a wasteful number, since it uses less digits than its factorization.

20908402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1965.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20908402 is about 4572.5706118113. The cubic root of 20908402 is about 275.4907029448.

The spelling of 20908402 in words is "twenty million, nine hundred eight thousand, four hundred two".