20401023020 has 24 divisors (see below), whose sum is σ = 48962455584. Its totient is φ = 6994636416.

The previous prime is 20401023017. The next prime is 20401023047. The reversal of 20401023020 is 2032010402.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 20401022986 and 20401023004.

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, 72860657 + ... + 72860936.

It is an arithmetic number, because the mean of its divisors is an integer number (2040102316).

Almost surely, 2^20401023020 is an apocalyptic number.

20401023020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20401023020 is an abundant number, since it is smaller than the sum of its proper divisors (28561432564).

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

20401023020 is a wasteful number, since it uses less digits than its factorization.

20401023020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145721609 (or 145721607 counting only the distinct ones).

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

Adding to 20401023020 its reverse (2032010402), we get a palindrome (22433033422).

The spelling of 20401023020 in words is "twenty billion, four hundred one million, twenty-three thousand, twenty".