20402650 has 24 divisors (see below), whose sum is σ = 39176064. Its totient is φ = 7897200.

The previous prime is 20402647. The next prime is 20402663. The reversal of 20402650 is 5620402.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5032 + ... + 8131.

It is an arithmetic number, because the mean of its divisors is an integer number (1632336).

Almost surely, 2^20402650 is an apocalyptic number.

20402650 is a deficient number, since it is larger than the sum of its proper divisors (18773414).

20402650 is a wasteful number, since it uses less digits than its factorization.

20402650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13206 (or 13201 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20402650 is about 4516.9292666589. The cubic root of 20402650 is about 273.2512725436.

The spelling of 20402650 in words is "twenty million, four hundred two thousand, six hundred fifty".