20997402 has 8 divisors (see below), whose sum is σ = 41994816. Its totient is φ = 6999132.

The previous prime is 20997377. The next prime is 20997407. The reversal of 20997402 is 20479902.

It is a sphenic number, since it is the product of 3 distinct primes.

20997402 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20997407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1749778 + ... + 1749789.

It is an arithmetic number, because the mean of its divisors is an integer number (5249352).

Almost surely, 2^20997402 is an apocalyptic number.

20997402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20997402 is a wasteful number, since it uses less digits than its factorization.

20997402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3499572.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20997402 is about 4582.2922211487. The cubic root of 20997402 is about 275.8810398911.

The spelling of 20997402 in words is "twenty million, nine hundred ninety-seven thousand, four hundred two".