20602397940 has 48 divisors (see below), whose sum is σ = 57695948352. Its totient is φ = 5493093376.

The previous prime is 20602397909. The next prime is 20602397941. The reversal of 20602397940 is 4979320602.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20602397892 and 20602397901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20602397941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407332 + ... + 455108.

It is an arithmetic number, because the mean of its divisors is an integer number (1201998924).

Almost surely, 2^20602397940 is an apocalyptic number.

20602397940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20602397940 is an abundant number, since it is smaller than the sum of its proper divisors (37093550412).

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

20602397940 is a wasteful number, since it uses less digits than its factorization.

20602397940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54976 (or 54974 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 42.

The spelling of 20602397940 in words is "twenty billion, six hundred two million, three hundred ninety-seven thousand, nine hundred forty".