20122023402 has 80 divisors (see below), whose sum is σ = 48838121640. Its totient is φ = 6155491968.

The previous prime is 20122023401. The next prime is 20122023443. The reversal of 20122023402 is 20432022102.

20122023402 is a `hidden beast` number, since 20 + 1 + 220 + 23 + 402 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 20095614081 + 26409321 = 141759^2 + 5139^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20122023401) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 336724 + ... + 391952.

Almost surely, 2^20122023402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20122023402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24419060820).

20122023402 is an abundant number, since it is smaller than the sum of its proper divisors (28716098238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20122023402 is a wasteful number, since it uses less digits than its factorization.

20122023402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55429 (or 55420 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 20122023402 its reverse (20432022102), we get a palindrome (40554045504).

The spelling of 20122023402 in words is "twenty billion, one hundred twenty-two million, twenty-three thousand, four hundred two".