20401023002 has 4 divisors (see below), whose sum is σ = 30601534506. Its totient is φ = 10200511500.

The previous prime is 20401023001. The next prime is 20401023017. The reversal of 20401023002 is 20032010402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13333089961 + 7067933041 = 115469^2 + 84071^2 .

It is not an unprimeable number, because it can be changed into a prime (20401023001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5100255749 + ... + 5100255752.

Almost surely, 2^20401023002 is an apocalyptic number.

20401023002 is a deficient number, since it is larger than the sum of its proper divisors (10200511504).

20401023002 is a wasteful number, since it uses less digits than its factorization.

20401023002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10200511503.

The product of its (nonzero) digits is 96, while the sum is 14.

Adding to 20401023002 its reverse (20032010402), we get a palindrome (40433033404).

The spelling of 20401023002 in words is "twenty billion, four hundred one million, twenty-three thousand, two".