20402692 has 6 divisors (see below), whose sum is σ = 35704718. Its totient is φ = 10201344.

The previous prime is 20402687. The next prime is 20402693. The reversal of 20402692 is 29620402.

It can be written as a sum of positive squares in only one way, i.e., 11723776 + 8678916 = 3424^2 + 2946^2 .

It is not an unprimeable number, because it can be changed into a prime (20402693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2550333 + ... + 2550340.

Almost surely, 2^20402692 is an apocalyptic number.

It is an amenable number.

20402692 is a deficient number, since it is larger than the sum of its proper divisors (15302026).

20402692 is a wasteful number, since it uses less digits than its factorization.

20402692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5100677 (or 5100675 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20402692 is about 4516.9339158327. The cubic root of 20402692 is about 273.2514600445.

The spelling of 20402692 in words is "twenty million, four hundred two thousand, six hundred ninety-two".