20420402 has 8 divisors (see below), whose sum is σ = 32242800. Its totient is φ = 9672804.

The previous prime is 20420377. The next prime is 20420443. The reversal of 20420402 is 20402402.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268652 + ... + 268727.

It is an arithmetic number, because the mean of its divisors is an integer number (4030350).

Almost surely, 2^20420402 is an apocalyptic number.

20420402 is a deficient number, since it is larger than the sum of its proper divisors (11822398).

20420402 is a wasteful number, since it uses less digits than its factorization.

20420402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537400.

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 20420402 is about 4518.8938912083. The cubic root of 20420402 is about 273.3305000037.

Adding to 20420402 its reverse (20402402), we get a palindrome (40822804).

The spelling of 20420402 in words is "twenty million, four hundred twenty thousand, four hundred two".