20402037 has 24 divisors (see below), whose sum is σ = 30873024. Its totient is φ = 13462848.

The previous prime is 20402021. The next prime is 20402087. The reversal of 20402037 is 73020402.

It is a happy number.

It is not a de Polignac number, because 20402037 - 2⁴ = 20402021 is a prime.

It is a super-2 number, since 2×20402037² = 832486227498738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27088 + ... + 27830.

It is an arithmetic number, because the mean of its divisors is an integer number (1286376).

Almost surely, 2^20402037 is an apocalyptic number.

20402037 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20402037 is a deficient number, since it is larger than the sum of its proper divisors (10470987).

20402037 is an equidigital number, since it uses as much as digits as its factorization.

20402037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871 (or 859 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 20402037 is about 4516.8614103158. The cubic root of 20402037 is about 273.2485358941.

Adding to 20402037 its reverse (73020402), we get a palindrome (93422439).

The spelling of 20402037 in words is "twenty million, four hundred two thousand, thirty-seven".