20402554 has 16 divisors (see below), whose sum is σ = 31854240. Its totient is φ = 9792720.

The previous prime is 20402537. The next prime is 20402563. The reversal of 20402554 is 45520402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3064 + ... + 7084.

It is an arithmetic number, because the mean of its divisors is an integer number (1990890).

Almost surely, 2^20402554 is an apocalyptic number.

20402554 is a deficient number, since it is larger than the sum of its proper divisors (11451686).

20402554 is a wasteful number, since it uses less digits than its factorization.

20402554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4125.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 20402554 is about 4516.9186399580. The cubic root of 20402554 is about 273.2508439691.

Adding to 20402554 its reverse (45520402), we get a palindrome (65922956).

The spelling of 20402554 in words is "twenty million, four hundred two thousand, five hundred fifty-four".